Vulnerability-Lookup

CVE-2026-27018 (GCVE-0-2026-27018)

Vulnerability from cvelistv5 – Published: 2026-03-30 20:14 – Updated: 2026-03-31 14:16

Title

Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme

Summary

Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0.

Severity

7.8 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-31 14:16 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/gotenberg/gotenberg/security/a…	x_refsource_CONFIRM
https://github.com/gotenberg/gotenberg/commit/06b…	x_refsource_MISC
https://github.com/gotenberg/gotenberg/commit/862…	x_refsource_MISC
https://github.com/gotenberg/gotenberg/releases/t…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
gotenberg	gotenberg	Affected: < 8.29.0	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-27018",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T14:16:17.015824Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-03-31T14:16:20.913Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "gotenberg",
          "vendor": "gotenberg",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 8.29.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-03-30T20:14:32.860Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
        },
        {
          "name": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11"
        },
        {
          "name": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5"
        },
        {
          "name": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0"
        }
      ],
      "source": {
        "advisory": "GHSA-jjwv-57xh-xr6r",
        "discovery": "UNKNOWN"
      },
      "title": "Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-27018",
    "datePublished": "2026-03-30T20:14:32.860Z",
    "dateReserved": "2026-02-17T03:08:23.490Z",
    "dateUpdated": "2026-03-31T14:16:20.913Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-27018",
      "date": "2026-09-25",
      "epss": "0.01632",
      "percentile": "0.7523"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "gotenberg",
                "vendor": "gotenberg",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 8.29.0"
                  }
                ]
              }
            ],
            "source": "security-advisories@github.com"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "7EDB2893-B553-47ED-AC5A-4C26628D358E",
                    "versionEndExcluding": "8.29.0",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0."
          },
          {
            "lang": "es",
            "value": "Gotenberg es una API para convertir formatos de documentos. Antes de la versi\u00f3n 8.29.0, la correcci\u00f3n introducida para CVE-2024-21527 puede ser eludida utilizando esquemas de URL en may\u00fasculas y min\u00fasculas o en may\u00fasculas. Este problema ha sido parcheado en la versi\u00f3n 8.29.0."
          }
        ],
        "id": "CVE-2026-27018",
        "lastModified": "2026-06-17T10:26:32.693",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "PROOF_OF_CONCEPT",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "LOW",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-27018",
                "options": [
                  {
                    "exploitation": "poc"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-03-31T14:16:17.015824Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-03-30T21:17:08.383",
        "references": [
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Patch"
            ],
            "url": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Patch"
            ],
            "url": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Product",
              "Release Notes"
            ],
            "url": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0"
          },
          {
            "source": "security-advisories@github.com",
            "tags": [
              "Exploit",
              "Mitigation",
              "Vendor Advisory"
            ],
            "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "tags": [
              "Exploit",
              "Mitigation",
              "Vendor Advisory"
            ],
            "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-22"
              },
              {
                "lang": "en",
                "value": "CWE-918"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "current_release_date": "2026-03-31T22:58:16+00:00",
      "cve": "CVE-2026-27018",
      "id": "CVE-2026-27018",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27018.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-04-08T23:26:48Z",
      "cve": "CVE-2026-27018",
      "id": "CVE-2026-27018",
      "initial_release_date": "2026-04-06T23:25:16Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-27018",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-27018.json",
      "version": "4"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-27018",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-03-31T14:16:17.015824Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-03-31T14:16:11.237Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "exploit"
                ],
                "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "gotenberg",
              "vendor": "gotenberg",
              "versions": [
                {
                  "status": "affected",
                  "version": "\u003c 8.29.0"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0."
            }
          ],
          "metrics": [
            {
              "cvssV4_0": {
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "privilegesRequired": "NONE",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
                "version": "4.0",
                "vulnAvailabilityImpact": "NONE",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "LOW"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-22",
                  "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            },
            {
              "descriptions": [
                {
                  "cweId": "CWE-918",
                  "description": "CWE-918: Server-Side Request Forgery (SSRF)",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-03-30T20:14:32.860Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
            },
            {
              "name": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11"
            },
            {
              "name": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5"
            },
            {
              "name": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0"
            }
          ],
          "source": {
            "advisory": "GHSA-jjwv-57xh-xr6r",
            "discovery": "UNKNOWN"
          },
          "title": "Gotenberg: Chromium deny-list bypass via case-insensitive URL scheme"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2026-27018",
        "datePublished": "2026-03-30T20:14:32.860Z",
        "dateReserved": "2026-02-17T03:08:23.490Z",
        "dateUpdated": "2026-03-30T20:14:32.860Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-27018

Vulnerability from fkie_nvd - Published: 2026-03-30 21:17 - Updated: 2026-06-17 10:26

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11	Patch
security-advisories@github.com	https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5	Patch
security-advisories@github.com	https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0	Product, Release Notes
security-advisories@github.com	https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r	Exploit, Mitigation, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r	Exploit, Mitigation, Vendor Advisory

Impacted products

	Vendor	Product	Version
	thecodingmachine	gotenberg	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "gotenberg",
          "vendor": "gotenberg",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 8.29.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:thecodingmachine:gotenberg:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7EDB2893-B553-47ED-AC5A-4C26628D358E",
              "versionEndExcluding": "8.29.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Gotenberg is an API for converting document formats. Prior to version 8.29.0, the fix introduced for CVE-2024-21527 can be bypassed using mixed-case or uppercase URL schemes. This issue has been patched in version 8.29.0."
    },
    {
      "lang": "es",
      "value": "Gotenberg es una API para convertir formatos de documentos. Antes de la versi\u00f3n 8.29.0, la correcci\u00f3n introducida para CVE-2024-21527 puede ser eludida utilizando esquemas de URL en may\u00fasculas y min\u00fasculas o en may\u00fasculas. Este problema ha sido parcheado en la versi\u00f3n 8.29.0."
    }
  ],
  "id": "CVE-2026-27018",
  "lastModified": "2026-06-17T10:26:32.693",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "PROOF_OF_CONCEPT",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27018",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-31T14:16:17.015824Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-30T21:17:08.383",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-JJWV-57XH-XR6R

Vulnerability from github – Published: 2026-03-30 16:16 – Updated: 2026-04-06 17:26

Summary

Gotenberg has Chromium deny-list bypass via case-insensitive URL scheme (bypass of GHSA-rh2x-ccvw-q7r3)

Details

Impact

The fix introduced in version 8.1.0 for GHSA-rh2x-ccvw-q7r3 (CVE-2024-21527) can be bypassed using mixed-case or uppercase URL schemes.

The default --chromium-deny-list value is ^file:(?!//\/tmp/).*. This regex is anchored to lowercase file: at the start. However, per RFC 3986 Section 3.1, URI schemes are case-insensitive. Chromium normalizes the scheme to lowercase before navigation, so a URL like FILE:///etc/passwd or File:///etc/passwd bypasses the deny-list check but still gets resolved by Chromium as file:///etc/passwd.

The root cause is in pkg/gotenberg/filter.go — the FilterDeadline function compiles the deny-list regex with regexp2.MustCompile(denied.String(), 0), where 0 means no flags (case-sensitive). Since the regex pattern itself doesn't include a (?i) flag, matching is strictly case-sensitive.

This affects both the URL endpoint and HTML conversion (via iframes, link tags, etc.).

Steps to Reproduce

Start Gotenberg with default settings:

docker run --rm -p 3000:3000 gotenberg/gotenberg:8.26.0 gotenberg

Read /etc/passwd via the URL endpoint using an uppercase scheme:

curl -X POST 'http://localhost:3000/forms/chromium/convert/url' \
  --form 'url=FILE:///etc/passwd' -o output.pdf

Open output.pdf — it contains the contents of /etc/passwd.
Alternatively, create an index.html:

<iframe src="FILE:///etc/passwd" width="100%" height="100%"></iframe>

Then convert it:

curl -X POST 'http://localhost:3000/forms/chromium/convert/html' \
  -F 'files=@index.html' -o output.pdf

The resulting PDF contains /etc/passwd contents.

Mixed-case variants like File:, fILE:, fiLE: etc. all work as well.

Root Cause

pkg/modules/chromium/chromium.go defines the default deny-list as ^file:(?!//\/tmp/).*
pkg/gotenberg/filter.go compiles this with regexp2.MustCompile(denied.String(), 0) — flag 0 means case-sensitive
pkg/modules/chromium/events.go uses FilterDeadline to check intercepted request URLs against the deny-list
Chromium normalizes URL schemes to lowercase, so FILE:///etc/passwd becomes file:///etc/passwd after the deny-list check has already passed

Suggested Fix

Change the default deny-list regex to use a case-insensitive flag:

(?i)^file:(?!//\/tmp/).*

Or apply case-insensitive matching in FilterDeadline when compiling the regex.

Severity

This is effectively the same impact as CVE-2024-21527 — unauthenticated arbitrary file read from the Gotenberg container. An attacker can leak environment variables, configuration, credentials, and other sensitive data.

Severity

7.8 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gotenberg/gotenberg/v8"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.29.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/gotenberg/gotenberg/v7"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "7.10.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-27018"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-30T16:16:07Z",
    "nvd_published_at": "2026-03-30T21:17:08Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe fix introduced in version 8.1.0 for GHSA-rh2x-ccvw-q7r3 (CVE-2024-21527) can be bypassed using mixed-case or uppercase URL schemes.\n\nThe default `--chromium-deny-list` value is `^file:(?!//\\/tmp/).*`. This regex is anchored to lowercase `file:` at the start. However, per RFC 3986 Section 3.1, URI schemes are case-insensitive. Chromium normalizes the scheme to lowercase before navigation, so a URL like `FILE:///etc/passwd` or `File:///etc/passwd` bypasses the deny-list check but still gets resolved by Chromium as `file:///etc/passwd`.\n\nThe root cause is in `pkg/gotenberg/filter.go` \u2014 the `FilterDeadline` function compiles the deny-list regex with `regexp2.MustCompile(denied.String(), 0)`, where `0` means no flags (case-sensitive). Since the regex pattern itself doesn\u0027t include a `(?i)` flag, matching is strictly case-sensitive.\n\nThis affects both the URL endpoint and HTML conversion (via iframes, link tags, etc.).\n\n### Steps to Reproduce\n\n1. Start Gotenberg with default settings:\n\n```bash\ndocker run --rm -p 3000:3000 gotenberg/gotenberg:8.26.0 gotenberg\n```\n\n2. Read `/etc/passwd` via the URL endpoint using an uppercase scheme:\n\n```bash\ncurl -X POST \u0027http://localhost:3000/forms/chromium/convert/url\u0027 \\\n  --form \u0027url=FILE:///etc/passwd\u0027 -o output.pdf\n```\n\n3. Open `output.pdf` \u2014 it contains the contents of `/etc/passwd`.\n\n4. Alternatively, create an `index.html`:\n\n```html\n\u003ciframe src=\"FILE:///etc/passwd\" width=\"100%\" height=\"100%\"\u003e\u003c/iframe\u003e\n```\n\nThen convert it:\n\n```bash\ncurl -X POST \u0027http://localhost:3000/forms/chromium/convert/html\u0027 \\\n  -F \u0027files=@index.html\u0027 -o output.pdf\n```\n\n5. The resulting PDF contains `/etc/passwd` contents.\n\nMixed-case variants like `File:`, `fILE:`, `fiLE:` etc. all work as well.\n\n### Root Cause\n\n- `pkg/modules/chromium/chromium.go` defines the default deny-list as `^file:(?!//\\/tmp/).*`\n- `pkg/gotenberg/filter.go` compiles this with `regexp2.MustCompile(denied.String(), 0)` \u2014 flag `0` means case-sensitive\n- `pkg/modules/chromium/events.go` uses `FilterDeadline` to check intercepted request URLs against the deny-list\n- Chromium normalizes URL schemes to lowercase, so `FILE:///etc/passwd` becomes `file:///etc/passwd` after the deny-list check has already passed\n\n### Suggested Fix\n\nChange the default deny-list regex to use a case-insensitive flag:\n\n```\n(?i)^file:(?!//\\/tmp/).*\n```\n\nOr apply case-insensitive matching in `FilterDeadline` when compiling the regex.\n\n### Severity\n\nThis is effectively the same impact as CVE-2024-21527 \u2014 unauthenticated arbitrary file read from the Gotenberg container. An attacker can leak environment variables, configuration, credentials, and other sensitive data.",
  "id": "GHSA-jjwv-57xh-xr6r",
  "modified": "2026-04-06T17:26:27Z",
  "published": "2026-03-30T16:16:07Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-jjwv-57xh-xr6r"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/security/advisories/GHSA-rh2x-ccvw-q7r3"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27018"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/commit/06b2b2e10c52b58135edbfe82e94d599eb0c5a11"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/commit/8625a4e899eb75e6fcf46d28394334c7fd79fff5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gotenberg/gotenberg"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gotenberg/gotenberg/releases/tag/v8.29.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Gotenberg has Chromium deny-list bypass via case-insensitive URL scheme (bypass of GHSA-rh2x-ccvw-q7r3)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-27018 (GCVE-0-2026-27018)

FKIE_CVE-2026-27018

GHSA-JJWV-57XH-XR6R

Impact

Steps to Reproduce

Root Cause

Suggested Fix

Severity

Tags

Sightings

Nomenclature

Related by attack behaviour