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CVE-2026-48824 (GCVE-0-2026-48824)

Vulnerability from nvd – Published: 2026-07-20 15:02 – Updated: 2026-07-20 19:07

Title

Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/messages, /api/v1/tags, and /api/v1/message/{id}/release (incomplete fix of GHSA-fpxj-m5q8-fphw)

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.1, the fix for GHSA-fpxj-m5q8-fphw (CVE-2026-45710, "Mailpit: Set a default 50MB p/m limit to prevent DoS via unlimited SMTP DATA and /api/v1/send body sizes") wrapped only `POST /api/v1/send` with `http.MaxBytesReader`. The four other Mailpit JSON-body API endpoints `PUT /api/v1/messages` (SetReadStatus), `DELETE /api/v1/messages` (DeleteMessages), `PUT /api/v1/tags` (SetMessageTags), and `POST /api/v1/message/{id}/release` (ReleaseMessage) still call `json.NewDecoder(r.Body)` directly with no body-size cap and remain reachable unauthenticated in the default `docker run axllent/mailpit:latest` deploy. An unauthenticated remote attacker can post a multi-million-element `IDs` slice and drive RSS from ~25 MiB baseline to ~450 MiB per 16 MB request body. Repeating across multiple connections accumulates the same per-request amplification per process. Version 1.30.1 contains a patch.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-48824",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T19:01:37.901255Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-20T19:07:58.952Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.1, the fix for GHSA-fpxj-m5q8-fphw (CVE-2026-45710, \"Mailpit: Set a default 50MB p/m limit to prevent DoS via unlimited SMTP DATA and /api/v1/send body sizes\") wrapped only `POST /api/v1/send` with `http.MaxBytesReader`. The four other Mailpit JSON-body API endpoints  `PUT /api/v1/messages` (SetReadStatus), `DELETE /api/v1/messages` (DeleteMessages), `PUT /api/v1/tags` (SetMessageTags), and `POST /api/v1/message/{id}/release` (ReleaseMessage)  still call `json.NewDecoder(r.Body)` directly with no body-size cap and remain reachable unauthenticated in the default `docker run axllent/mailpit:latest` deploy. An unauthenticated remote attacker can post a multi-million-element `IDs` slice and drive RSS from ~25 MiB baseline to ~450 MiB per 16 MB request body. Repeating across multiple connections accumulates the same per-request amplification per process. Version 1.30.1 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T15:02:52.107Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-28pq-6qxg-wg5r",
          "tags": [
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          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-28pq-6qxg-wg5r"
        },
        {
          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.1"
        }
      ],
      "source": {
        "advisory": "GHSA-28pq-6qxg-wg5r",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/messages, /api/v1/tags, and /api/v1/message/{id}/release (incomplete fix of GHSA-fpxj-m5q8-fphw)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-48824",
    "datePublished": "2026-07-20T15:02:52.107Z",
    "dateReserved": "2026-05-22T20:57:10.977Z",
    "dateUpdated": "2026-07-20T19:07:58.952Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-45713 (GCVE-0-2026-45713)

Vulnerability from nvd – Published: 2026-07-20 15:01 – Updated: 2026-07-20 16:16

Title

Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/send body sizes

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit SMTP server has a Server.MaxSize int field that controls the maximum allowed DATA payload size, but the field is never assigned anywhere outside test code, leaving it at Go's zero value (0 ⇒ "no limit"). The same applies to the HTTP /api/v1/send endpoint, whose request body is decoded with json.NewDecoder(r.Body) and no http.MaxBytesReader. Because Mailpit's default listeners bind [::]:1025 (SMTP) and [::]:8025 (HTTP), with no authentication required on either, a single network-reachable attacker can push an arbitrarily large message into Mailpit and watch RAM consumption spike with a ~7-10× amplification factor (raw frame → enmime envelope tree → search-text index → zstd-encoded write to SQLite). Repeating the attack — or running it concurrently from multiple connections — drives the process to OOM-kill. Version 1.30.0 contains a patch.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45713",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T16:16:33.595846Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-20T16:16:44.713Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit SMTP server has a Server.MaxSize int field that controls the maximum allowed DATA payload size, but the field is never assigned anywhere outside test code, leaving it at Go\u0027s zero value (0 \u21d2 \"no limit\"). The same applies to the HTTP /api/v1/send endpoint, whose request body is decoded with json.NewDecoder(r.Body) and no http.MaxBytesReader. Because Mailpit\u0027s default listeners bind [::]:1025 (SMTP) and [::]:8025 (HTTP), with no authentication required on either, a single network-reachable attacker can push an arbitrarily large message into Mailpit and watch RAM consumption spike with a ~7-10\u00d7 amplification factor (raw frame \u2192 enmime envelope tree \u2192 search-text index \u2192 zstd-encoded write to SQLite). Repeating the attack \u2014 or running it concurrently from multiple connections \u2014 drives the process to OOM-kill. Version 1.30.0 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T15:01:01.489Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw"
        },
        {
          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"
        }
      ],
      "source": {
        "advisory": "GHSA-fpxj-m5q8-fphw",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/send body sizes"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45713",
    "datePublished": "2026-07-20T15:01:01.489Z",
    "dateReserved": "2026-05-13T05:51:48.665Z",
    "dateUpdated": "2026-07-20T16:16:44.713Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-45712 (GCVE-0-2026-45712)

Vulnerability from nvd – Published: 2026-07-20 14:59 – Updated: 2026-07-20 15:33

Title

Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screenshot/print proxy (/proxy?data=…) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go's runtime raises fatal error: concurrent map read and map write — a runtime.throw that is not recoverable by http.Server's handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it. Version 1.30.0 contains a patch.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45712",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T15:32:57.656933Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-20T15:33:02.751Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screenshot/print proxy (/proxy?data=\u2026) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go\u0027s runtime raises fatal error: concurrent map read and map write \u2014 a runtime.throw that is not recoverable by http.Server\u0027s handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it. Version 1.30.0 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T14:59:40.516Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722"
        },
        {
          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"
        }
      ],
      "source": {
        "advisory": "GHSA-w4vj-r5pg-3722",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Concurrent map read \u0026 write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45712",
    "datePublished": "2026-07-20T14:59:40.516Z",
    "dateReserved": "2026-05-13T05:51:48.665Z",
    "dateUpdated": "2026-07-20T15:33:02.751Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-45711 (GCVE-0-2026-45711)

Vulnerability from nvd – Published: 2026-07-20 14:39 – Updated: 2026-07-21 15:42

Title

Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http <base-url> <out-dir> sub-command downloads every message from a remote Mailpit instance and writes each one as <id>.eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45711",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-21T15:38:53.037071Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-21T15:42:56.143Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http \u003cbase-url\u003e \u003cout-dir\u003e sub-command downloads every message from a remote Mailpit instance and writes each one as \u003cid\u003e.eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
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            "baseScore": 5.9,
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
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            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L",
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          }
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      "problemTypes": [
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          "descriptions": [
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              "cweId": "CWE-22",
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            }
          ]
        },
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          "descriptions": [
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            }
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      },
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            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j"
        },
        {
          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"
        }
      ],
      "source": {
        "advisory": "GHSA-qx5x-85p8-vg4j",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Path traversal \u0026 arbitrary file write in mailpit dump --http via attacker-controlled message IDs"
    }
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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "dateReserved": "2026-05-13T05:51:48.665Z",
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  },
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}

CVE-2026-45709 (GCVE-0-2026-45709)

Vulnerability from nvd – Published: 2026-07-20 14:37 – Updated: 2026-07-20 19:08

Title

Mailpit has an incomplete fix for GHSA-6jxm: HTML check still permits SSRF to private/loopback/IMDS via missing IP-filter dialer

Summary

Mailpit is an email testing tool and API for developers. The fix for GHSA-6jxm-fv7w-rw5j (CVE-2026-23845, "Server-Side Request Forgery (SSRF) via HTML Check API"), shipped in mailpit `v1.28.3`, hardened `internal/htmlcheck/css.go::downloadCSSToBytes` with a 5MB size cap, a `text/css` content-type check, login-info stripping in `isValidURL`, and an opt-in `--block-remote-css-and-fonts` config flag — but did not add the IP-filtering dialer that the same codebase already uses on the two sister SSRF endpoints (the proxy handler and link-check). Prior to version 1.30.0, `internal/htmlcheck/css.go::newSafeHTTPClient` is mis-named — it builds an `http.Client` whose `Transport.DialContext` calls `net.Dialer.DialContext` directly with no IP allowlisting. As a result, the SSRF originally reported by Bao Anh Phan still permits the server to dial loopback, private, link-local, and any other reserved/multicast range, provided the target replies with `HTTP/200` and a content-type beginning with `text/css`. With redirect-following (`CheckRedirect` allows redirects to any `isValidURL` URL with no IP filter), an attacker-controlled public site can redirect mailpit's request into the private network without ever appearing in the email's HTML. In the default mailpit deploy (no UI auth, no SMTP auth, port 1025/8025 exposed), this is an unauthenticated, network-reachable SSRF triggered by sending an HTML email and then issuing one HTTP `GET` to `/api/v1/message/{id}/html-check`. Version 1.30.0 contains an updated fix.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: >= 1.28.3, < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45709",
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  },
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CVE-2026-55187 (GCVE-0-2026-55187)

Vulnerability from nvd – Published: 2026-07-10 21:43 – Updated: 2026-07-13 15:55

Title

Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)

Summary

Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation shipped for CVE-2026-27808 is incomplete because the tools.IsInternalIP deny-list in internal/tools/net.go relies on Go's standard library classification helpers and does not block IPv6 transition mechanisms or prefixes such as NAT64, 6to4, IPv4-compatible IPv6, ISATAP, fec0::/10, and 2001:db8::/32. An attacker who can deliver email and invoke POST /api/v1/message/{ID}/link-check can coerce the Link Check API's safeDialContext path into dialing internal destinations and can use status-code and error feedback to map internal service reachability, including cloud metadata endpoints. This issue is fixed in version 1.30.2.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/a88dadb…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.30.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55187",
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                    "Technical Impact": "partial"
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    ],
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      },
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          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28",
          "tags": [
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          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"
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      "title": "Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)"
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "state": "PUBLISHED"
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}

CVE-2026-27808 (GCVE-0-2026-27808)

Vulnerability from nvd – Published: 2026-02-25 23:51 – Updated: 2026-02-26 15:47

Title

Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to Server-Side Request Forgery (SSRF). The server performs HTTP HEAD requests to every URL found in an email without validating target hosts or filtering private/internal IP addresses. The response returns status codes and status text per link, making this a non-blind SSRF. In the default configuration (no authentication on SMTP or API), this is fully exploitable remotely with zero user interaction. This is the same class of vulnerability that was fixed in the HTML Check API (CVE-2026-23845 / GHSA-6jxm-fv7w-rw5j) and the screenshot proxy (CVE-2026-21859 / GHSA-8v65-47jx-7mfr), but the Link Check code path was not included in either fix. Version 1.29.2 fixes this vulnerability.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/10ad4df…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.29.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.29.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-27808",
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                  },
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                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2026-02-26T15:47:50.457289Z",
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          }
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    ],
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          "product": "mailpit",
          "vendor": "axllent",
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              "status": "affected",
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            }
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        {
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        }
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      ],
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        "advisory": "GHSA-mpf7-p9x7-96r3",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API"
    }
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CVE-2026-23845 (GCVE-0-2026-23845)

Vulnerability from nvd – Published: 2026-01-19 19:01 – Updated: 2026-01-20 20:05

Title

Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API

Summary

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/1679a0a…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.28.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-23829 (GCVE-0-2026-23829)

Vulnerability from nvd – Published: 2026-01-18 23:23 – Updated: 2026-01-20 20:08

Title

Mailpit has SMTP Header Injection via Regex Bypass

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\r` and `\n` when used inside a character class. Version 1.28.3 fixes this issue.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/36cc06c…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.28.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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CVE-2026-22689 (GCVE-0-2026-22689)

Vulnerability from nvd – Published: 2026-01-10 05:46 – Updated: 2026-01-12 16:47

Title

Mailpit is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) allowing unauthenticated access to emails

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.28.2, the Mailpit WebSocket server is configured to accept connections from any origin. This lack of Origin header validation introduces a Cross-Site WebSocket Hijacking (CSWSH) vulnerability. An attacker can host a malicious website that, when visited by a developer running Mailpit locally, establishes a WebSocket connection to the victim's Mailpit instance (default ws://localhost:8025). This allows the attacker to intercept sensitive data such as email contents, headers, and server statistics in real-time. This issue has been patched in version 1.28.2.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1385 - Missing Origin Validation in WebSockets

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/6f1f4f3…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-22689",
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CVE-2026-21859 (GCVE-0-2026-21859)

Vulnerability from nvd – Published: 2026-01-07 23:24 – Updated: 2026-01-08 19:23

Title

Mailpit Proxy Endpoint is Vulnerable to Server-Side Request Forgery (SSRF)

Summary

Mailpit is an email testing tool and API for developers. Versions 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.1.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/3b9b470…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
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    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-21859",
    "datePublished": "2026-01-07T23:24:07.869Z",
    "dateReserved": "2026-01-05T16:44:16.367Z",
    "dateUpdated": "2026-01-08T19:23:22.033Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-48824 (GCVE-0-2026-48824)

Vulnerability from cvelistv5 – Published: 2026-07-20 15:02 – Updated: 2026-07-20 19:07

Title

Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/messages, /api/v1/tags, and /api/v1/message/{id}/release (incomplete fix of GHSA-fpxj-m5q8-fphw)

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.1, the fix for GHSA-fpxj-m5q8-fphw (CVE-2026-45710, "Mailpit: Set a default 50MB p/m limit to prevent DoS via unlimited SMTP DATA and /api/v1/send body sizes") wrapped only `POST /api/v1/send` with `http.MaxBytesReader`. The four other Mailpit JSON-body API endpoints `PUT /api/v1/messages` (SetReadStatus), `DELETE /api/v1/messages` (DeleteMessages), `PUT /api/v1/tags` (SetMessageTags), and `POST /api/v1/message/{id}/release` (ReleaseMessage) still call `json.NewDecoder(r.Body)` directly with no body-size cap and remain reachable unauthenticated in the default `docker run axllent/mailpit:latest` deploy. An unauthenticated remote attacker can post a multi-million-element `IDs` slice and drive RSS from ~25 MiB baseline to ~450 MiB per 16 MB request body. Repeating across multiple connections accumulates the same per-request amplification per process. Version 1.30.1 contains a patch.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-48824",
                "options": [
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        }
      ],
      "metrics": [
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          "cvssV3_1": {
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      },
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          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-28pq-6qxg-wg5r",
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          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-28pq-6qxg-wg5r"
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          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.1",
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      ],
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        "advisory": "GHSA-28pq-6qxg-wg5r",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Sibling-endpoint memory-exhaustion DoS via unbounded JSON body on /api/v1/messages, /api/v1/tags, and /api/v1/message/{id}/release (incomplete fix of GHSA-fpxj-m5q8-fphw)"
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-45713 (GCVE-0-2026-45713)

Vulnerability from cvelistv5 – Published: 2026-07-20 15:01 – Updated: 2026-07-20 16:16

Title

Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/send body sizes

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit SMTP server has a Server.MaxSize int field that controls the maximum allowed DATA payload size, but the field is never assigned anywhere outside test code, leaving it at Go's zero value (0 ⇒ "no limit"). The same applies to the HTTP /api/v1/send endpoint, whose request body is decoded with json.NewDecoder(r.Body) and no http.MaxBytesReader. Because Mailpit's default listeners bind [::]:1025 (SMTP) and [::]:8025 (HTTP), with no authentication required on either, a single network-reachable attacker can push an arbitrarily large message into Mailpit and watch RAM consumption spike with a ~7-10× amplification factor (raw frame → enmime envelope tree → search-text index → zstd-encoded write to SQLite). Repeating the attack — or running it concurrently from multiple connections — drives the process to OOM-kill. Version 1.30.0 contains a patch.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-400 - Uncontrolled Resource Consumption
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45713",
                "options": [
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                  },
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                    "Technical Impact": "partial"
                  }
                ],
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                "timestamp": "2026-07-20T16:16:33.595846Z",
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      }
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          "vendor": "axllent",
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            }
          ]
        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit SMTP server has a Server.MaxSize int field that controls the maximum allowed DATA payload size, but the field is never assigned anywhere outside test code, leaving it at Go\u0027s zero value (0 \u21d2 \"no limit\"). The same applies to the HTTP /api/v1/send endpoint, whose request body is decoded with json.NewDecoder(r.Body) and no http.MaxBytesReader. Because Mailpit\u0027s default listeners bind [::]:1025 (SMTP) and [::]:8025 (HTTP), with no authentication required on either, a single network-reachable attacker can push an arbitrarily large message into Mailpit and watch RAM consumption spike with a ~7-10\u00d7 amplification factor (raw frame \u2192 enmime envelope tree \u2192 search-text index \u2192 zstd-encoded write to SQLite). Repeating the attack \u2014 or running it concurrently from multiple connections \u2014 drives the process to OOM-kill. Version 1.30.0 contains a patch."
        }
      ],
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            "attackComplexity": "LOW",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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          }
        }
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            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
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        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
      "references": [
        {
          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw",
          "tags": [
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          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-fpxj-m5q8-fphw"
        },
        {
          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.0",
          "tags": [
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      ],
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        "advisory": "GHSA-fpxj-m5q8-fphw",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Unauthenticated remote memory-exhaustion DoS via unlimited SMTP DATA and /api/v1/send body sizes"
    }
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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    "dateReserved": "2026-05-13T05:51:48.665Z",
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    "state": "PUBLISHED"
  },
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}

CVE-2026-45712 (GCVE-0-2026-45712)

Vulnerability from cvelistv5 – Published: 2026-07-20 14:59 – Updated: 2026-07-20 15:33

Title

Mailpit: Concurrent map read & write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screenshot/print proxy (/proxy?data=…) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go's runtime raises fatal error: concurrent map read and map write — a runtime.throw that is not recoverable by http.Server's handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it. Version 1.30.0 contains a patch.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45712",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-20T15:32:57.656933Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "providerMetadata": {
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          "shortName": "CISA-ADP"
        },
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          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screenshot/print proxy (/proxy?data=\u2026) maintains a package-level assets map[string]MessageAssets cache, but reads the map without holding assetsMutex while a long-running cleanup goroutine and (re-entrant) CSS-rewriting code path concurrently write to it under the lock. When the unsynchronized read coincides with a synchronized write, Go\u0027s runtime raises fatal error: concurrent map read and map write \u2014 a runtime.throw that is not recoverable by http.Server\u0027s handler-panic recover. The whole Mailpit process exits, taking the SMTP, POP3 and HTTP listeners down with it. Version 1.30.0 contains a patch."
        }
      ],
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        {
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
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            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
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            }
          ]
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              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
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            }
          ]
        }
      ],
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        "dateUpdated": "2026-07-20T14:59:40.516Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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      },
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          "name": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4vj-r5pg-3722"
        },
        {
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          "tags": [
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          "url": "https://github.com/axllent/mailpit/releases/tag/v1.30.0"
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        "advisory": "GHSA-w4vj-r5pg-3722",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Concurrent map read \u0026 write in proxy CSS rewriter - remote unauth crash (fatal error: concurrent map read and map write)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-45712",
    "datePublished": "2026-07-20T14:59:40.516Z",
    "dateReserved": "2026-05-13T05:51:48.665Z",
    "dateUpdated": "2026-07-20T15:33:02.751Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-45711 (GCVE-0-2026-45711)

Vulnerability from cvelistv5 – Published: 2026-07-20 14:39 – Updated: 2026-07-21 15:42

Title

Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http <base-url> <out-dir> sub-command downloads every message from a remote Mailpit instance and writes each one as <id>.eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-829 - Inclusion of Functionality from Untrusted Control Sphere

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-45711",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-21T15:38:53.037071Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-21T15:42:56.143Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
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            "tags": [
              "exploit"
            ],
            "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mailpit",
          "vendor": "axllent",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.30.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http \u003cbase-url\u003e \u003cout-dir\u003e sub-command downloads every message from a remote Mailpit instance and writes each one as \u003cid\u003e.eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch."
        }
      ],
      "metrics": [
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          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
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            }
          ]
        },
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          ],
          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j"
        },
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          "name": "https://github.com/axllent/mailpit/releases/tag/v1.30.0",
          "tags": [
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        }
      ],
      "source": {
        "advisory": "GHSA-qx5x-85p8-vg4j",
        "discovery": "UNKNOWN"
      },
      "title": "Mailpit: Path traversal \u0026 arbitrary file write in mailpit dump --http via attacker-controlled message IDs"
    }
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    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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}

CVE-2026-45709 (GCVE-0-2026-45709)

Vulnerability from cvelistv5 – Published: 2026-07-20 14:37 – Updated: 2026-07-20 19:08

Title

Mailpit has an incomplete fix for GHSA-6jxm: HTML check still permits SSRF to private/loopback/IMDS via missing IP-filter dialer

Summary

Mailpit is an email testing tool and API for developers. The fix for GHSA-6jxm-fv7w-rw5j (CVE-2026-23845, "Server-Side Request Forgery (SSRF) via HTML Check API"), shipped in mailpit `v1.28.3`, hardened `internal/htmlcheck/css.go::downloadCSSToBytes` with a 5MB size cap, a `text/css` content-type check, login-info stripping in `isValidURL`, and an opt-in `--block-remote-css-and-fonts` config flag — but did not add the IP-filtering dialer that the same codebase already uses on the two sister SSRF endpoints (the proxy handler and link-check). Prior to version 1.30.0, `internal/htmlcheck/css.go::newSafeHTTPClient` is mis-named — it builds an `http.Client` whose `Transport.DialContext` calls `net.Dialer.DialContext` directly with no IP allowlisting. As a result, the SSRF originally reported by Bao Anh Phan still permits the server to dial loopback, private, link-local, and any other reserved/multicast range, provided the target replies with `HTTP/200` and a content-type beginning with `text/css`. With redirect-following (`CheckRedirect` allows redirects to any `isValidURL` URL with no IP filter), an attacker-controlled public site can redirect mailpit's request into the private network without ever appearing in the email's HTML. In the default mailpit deploy (no UI auth, no SMTP auth, port 1025/8025 exposed), this is an unauthenticated, network-reachable SSRF triggered by sending an HTML email and then issuing one HTTP `GET` to `/api/v1/message/{id}/html-check`. Version 1.30.0 contains an updated fix.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/releases/tag/v1.30.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: >= 1.28.3, < 1.30.0

Show details on NVD website

JSON

To clipboard

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  "containers": {
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        "metrics": [
          {
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                "id": "CVE-2026-45709",
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CVE-2026-55187 (GCVE-0-2026-55187)

Vulnerability from cvelistv5 – Published: 2026-07-10 21:43 – Updated: 2026-07-13 15:55

Title

Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)

Summary

Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation shipped for CVE-2026-27808 is incomplete because the tools.IsInternalIP deny-list in internal/tools/net.go relies on Go's standard library classification helpers and does not block IPv6 transition mechanisms or prefixes such as NAT64, 6to4, IPv4-compatible IPv6, ISATAP, fec0::/10, and 2001:db8::/32. An attacker who can deliver email and invoke POST /api/v1/message/{ID}/link-check can coerce the Link Check API's safeDialContext path into dialing internal destinations and can use status-code and error feedback to map internal service reachability, including cloud metadata endpoints. This issue is fixed in version 1.30.2.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/a88dadb…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.30.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.30.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55187",
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          "url": "https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"
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    "state": "PUBLISHED"
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}

CVE-2026-27808 (GCVE-0-2026-27808)

Vulnerability from cvelistv5 – Published: 2026-02-25 23:51 – Updated: 2026-02-26 15:47

Title

Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.29.2, the Link Check API (/api/v1/message/{ID}/link-check) is vulnerable to Server-Side Request Forgery (SSRF). The server performs HTTP HEAD requests to every URL found in an email without validating target hosts or filtering private/internal IP addresses. The response returns status codes and status text per link, making this a non-blind SSRF. In the default configuration (no authentication on SMTP or API), this is fully exploitable remotely with zero user interaction. This is the same class of vulnerability that was fixed in the HTML Check API (CVE-2026-23845 / GHSA-6jxm-fv7w-rw5j) and the screenshot proxy (CVE-2026-21859 / GHSA-8v65-47jx-7mfr), but the Link Check code path was not included in either fix. Version 1.29.2 fixes this vulnerability.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/10ad4df…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.29.2	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.29.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-27808",
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                  },
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                    "Technical Impact": "partial"
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        "discovery": "UNKNOWN"
      },
      "title": "Mailpit is Vulnerable to Server-Side Request Forgery (SSRF) via Link Check API"
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CVE-2026-23845 (GCVE-0-2026-23845)

Vulnerability from cvelistv5 – Published: 2026-01-19 19:01 – Updated: 2026-01-20 20:05

Title

Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API

Summary

Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel="stylesheet" href="...">` tags to inline them for testing. Version 1.28.3 fixes the issue.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/1679a0a…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.28.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.3

Show details on NVD website

JSON

To clipboard

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CVE-2026-23829 (GCVE-0-2026-23829)

Vulnerability from cvelistv5 – Published: 2026-01-18 23:23 – Updated: 2026-01-20 20:08

Title

Mailpit has SMTP Header Injection via Regex Bypass

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.28.3, Mailpit's SMTP server is vulnerable to Header Injection due to an insufficient Regular Expression used to validate `RCPT TO` and `MAIL FROM` addresses. An attacker can inject arbitrary SMTP headers (or corrupt existing ones) by including carriage return characters (`\r`) in the email address. This header injection occurs because the regex intended to filter control characters fails to exclude `\r` and `\n` when used inside a character class. Version 1.28.3 fixes this issue.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
CWE-150 - Improper Neutralization of Escape, Meta, or Control Sequences

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/36cc06c…	x_refsource_MISC
https://github.com/axllent/mailpit/releases/tag/v1.28.3	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.3

Show details on NVD website

JSON

To clipboard

{
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CVE-2026-22689 (GCVE-0-2026-22689)

Vulnerability from cvelistv5 – Published: 2026-01-10 05:46 – Updated: 2026-01-12 16:47

Title

Mailpit is vulnerable to Cross-Site WebSocket Hijacking (CSWSH) allowing unauthenticated access to emails

Summary

Mailpit is an email testing tool and API for developers. Prior to version 1.28.2, the Mailpit WebSocket server is configured to accept connections from any origin. This lack of Origin header validation introduces a Cross-Site WebSocket Hijacking (CSWSH) vulnerability. An attacker can host a malicious website that, when visited by a developer running Mailpit locally, establishes a WebSocket connection to the victim's Mailpit instance (default ws://localhost:8025). This allows the attacker to intercept sensitive data such as email contents, headers, and server statistics in real-time. This issue has been patched in version 1.28.2.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-1385 - Missing Origin Validation in WebSockets

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/6f1f4f3…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
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CVE-2026-21859 (GCVE-0-2026-21859)

Vulnerability from cvelistv5 – Published: 2026-01-07 23:24 – Updated: 2026-01-08 19:23

Title

Mailpit Proxy Endpoint is Vulnerable to Server-Side Request Forgery (SSRF)

Summary

Mailpit is an email testing tool and API for developers. Versions 1.28.0 and below have a Server-Side Request Forgery (SSRF) vulnerability in the /proxy endpoint, allowing attackers to make requests to internal network resources. The /proxy endpoint validates http:// and https:// schemes, but it does not block internal IP addresses, enabling attackers to access internal services and APIs. This vulnerability is limited to HTTP GET requests with minimal headers. The issue is fixed in version 1.28.1.

Severity

5.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/axllent/mailpit/security/advis…	x_refsource_CONFIRM
https://github.com/axllent/mailpit/commit/3b9b470…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
axllent	mailpit	Affected: < 1.28.1

Show details on NVD website

JSON

To clipboard

{
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-21859",
    "datePublished": "2026-01-07T23:24:07.869Z",
    "dateReserved": "2026-01-05T16:44:16.367Z",
    "dateUpdated": "2026-01-08T19:23:22.033Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Find a vulnerability

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22 vulnerabilities by axllent

CVE-2026-48824 (GCVE-0-2026-48824)

CVE-2026-45713 (GCVE-0-2026-45713)

CVE-2026-45712 (GCVE-0-2026-45712)

CVE-2026-45711 (GCVE-0-2026-45711)

CVE-2026-45709 (GCVE-0-2026-45709)

CVE-2026-55187 (GCVE-0-2026-55187)

CVE-2026-27808 (GCVE-0-2026-27808)

CVE-2026-23845 (GCVE-0-2026-23845)

CVE-2026-23829 (GCVE-0-2026-23829)

CVE-2026-22689 (GCVE-0-2026-22689)

CVE-2026-21859 (GCVE-0-2026-21859)

CVE-2026-48824 (GCVE-0-2026-48824)

CVE-2026-45713 (GCVE-0-2026-45713)

CVE-2026-45712 (GCVE-0-2026-45712)

CVE-2026-45711 (GCVE-0-2026-45711)

CVE-2026-45709 (GCVE-0-2026-45709)

CVE-2026-55187 (GCVE-0-2026-55187)

CVE-2026-27808 (GCVE-0-2026-27808)

CVE-2026-23845 (GCVE-0-2026-23845)

CVE-2026-23829 (GCVE-0-2026-23829)

CVE-2026-22689 (GCVE-0-2026-22689)

CVE-2026-21859 (GCVE-0-2026-21859)

Find a vulnerability

Search criteria ⓘ Use this form to refine search results. Full-text search supports keyword queries with ranking and filtering. You can combine vendor, product, and sources to narrow results. Enable “Apply ordering” to sort by date instead of relevance.

22 vulnerabilities by axllent

CVE-2026-48824 (GCVE-0-2026-48824)

CVE-2026-45713 (GCVE-0-2026-45713)

CVE-2026-45712 (GCVE-0-2026-45712)

CVE-2026-45711 (GCVE-0-2026-45711)

CVE-2026-45709 (GCVE-0-2026-45709)

CVE-2026-55187 (GCVE-0-2026-55187)

CVE-2026-27808 (GCVE-0-2026-27808)

CVE-2026-23845 (GCVE-0-2026-23845)

CVE-2026-23829 (GCVE-0-2026-23829)

CVE-2026-22689 (GCVE-0-2026-22689)

CVE-2026-21859 (GCVE-0-2026-21859)

CVE-2026-48824 (GCVE-0-2026-48824)

CVE-2026-45713 (GCVE-0-2026-45713)

CVE-2026-45712 (GCVE-0-2026-45712)

CVE-2026-45711 (GCVE-0-2026-45711)

CVE-2026-45709 (GCVE-0-2026-45709)

CVE-2026-55187 (GCVE-0-2026-55187)

CVE-2026-27808 (GCVE-0-2026-27808)

CVE-2026-23845 (GCVE-0-2026-23845)

CVE-2026-23829 (GCVE-0-2026-23829)

CVE-2026-22689 (GCVE-0-2026-22689)

CVE-2026-21859 (GCVE-0-2026-21859)

Search criteria ⓘ Use this form to refine search results.
Full-text search supports keyword queries with ranking and filtering.
You can combine vendor, product, and sources to narrow results.
Enable “Apply ordering” to sort by date instead of relevance.