Vulnerability-Lookup

PYSEC-2026-92

Vulnerability from pysec - Published: 2026-04-21 18:16 - Updated: 2026-05-20 09:19

Details

mitmproxy is a interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers and mitmweb is a web-based interface for mitmproxy. In mitmproxy 12.2.1 and below, the builtin LDAP proxy authentication does not correctly sanitize the username when querying the LDAP server. This allows a malicious client to bypass authentication. Only mitmproxy instances using the proxyauth option with LDAP are affected. This option is not enabled by default. The vulnerability has been fixed in mitmproxy 12.2.2 and above.

Severity

4.8 (Medium)


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

Impacted products

Name	purl
mitmproxy	pkg:pypi/mitmproxy

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "mitmproxy",
        "purl": "pkg:pypi/mitmproxy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "12.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.10",
        "0.10.1",
        "0.11",
        "0.11.1",
        "0.11.2",
        "0.11.3",
        "0.12.0",
        "0.12.1",
        "0.13",
        "0.14.0",
        "0.15",
        "0.16",
        "0.17",
        "0.18.1",
        "0.18.2",
        "0.18.3",
        "0.8",
        "0.8.1",
        "0.9",
        "0.9.1",
        "0.9.2",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "10.0.0",
        "10.1.0",
        "10.1.1",
        "10.1.2",
        "10.1.3",
        "10.1.4",
        "10.1.5",
        "10.1.6",
        "10.2.0",
        "10.2.1",
        "10.2.2",
        "10.2.3",
        "10.2.4",
        "10.3.0",
        "10.3.1",
        "10.4.0",
        "10.4.1",
        "10.4.2",
        "11.0.0",
        "11.0.1",
        "11.0.2",
        "11.1.0",
        "11.1.2",
        "11.1.3",
        "12.0.0",
        "12.0.1",
        "12.1.0",
        "12.1.1",
        "12.1.2",
        "12.2.0",
        "12.2.1",
        "2.0.0",
        "2.0.1",
        "2.0.2",
        "3.0.0",
        "3.0.1",
        "3.0.2",
        "3.0.3",
        "3.0.4",
        "4.0.0",
        "4.0.1",
        "4.0.3",
        "4.0.4",
        "5.0.0",
        "5.0.1",
        "5.1.0",
        "5.1.1",
        "5.2",
        "5.3.0",
        "6.0.0",
        "6.0.1",
        "6.0.2",
        "7.0.0",
        "7.0.1",
        "7.0.2",
        "7.0.3",
        "7.0.4",
        "8.0.0",
        "8.1.0",
        "8.1.1",
        "9.0.0",
        "9.0.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40606",
    "GHSA-527g-3w9m-29hv"
  ],
  "details": "mitmproxy is a interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers and mitmweb is a web-based interface for mitmproxy. In mitmproxy 12.2.1 and below, the builtin LDAP proxy authentication does not correctly sanitize the username when querying the LDAP server. This allows a malicious client to bypass authentication. Only mitmproxy instances using the proxyauth option with LDAP are affected. This option is not enabled by default. The vulnerability has been fixed in mitmproxy 12.2.2 and above.",
  "id": "PYSEC-2026-92",
  "modified": "2026-05-20T09:19:08.113032Z",
  "published": "2026-04-21T18:16:52.127Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-527g-3w9m-29hv"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-40606 (GCVE-0-2026-40606)

Vulnerability from cvelistv5 – Published: 2026-04-21 17:43 – Updated: 2026-04-22 13:26

Title

ProxyAuth Addon LDAP Injection in mitmproxy

Summary

Severity

4.8 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 13:25 UTC

CWE

CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/mitmproxy/mitmproxy/security/a…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
mitmproxy	mitmproxy	Affected: < 12.2.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40606",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T13:25:44.220522Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-22T13:26:03.183Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "mitmproxy",
          "vendor": "mitmproxy",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 12.2.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "mitmproxy is a interactive TLS-capable intercepting HTTP proxy for penetration testers and software developers and mitmweb is a web-based interface for mitmproxy. In mitmproxy 12.2.1 and below, the builtin LDAP proxy authentication does not correctly sanitize the username when querying the LDAP server. This allows a malicious client to bypass authentication. Only mitmproxy instances using the proxyauth option with LDAP are affected. This option is not enabled by default. The vulnerability has been fixed in mitmproxy 12.2.2 and above."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-90",
              "description": "CWE-90: Improper Neutralization of Special Elements used in an LDAP Query (\u0027LDAP Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-21T17:43:21.041Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-527g-3w9m-29hv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-527g-3w9m-29hv"
        }
      ],
      "source": {
        "advisory": "GHSA-527g-3w9m-29hv",
        "discovery": "UNKNOWN"
      },
      "title": "ProxyAuth Addon LDAP Injection in mitmproxy"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40606",
    "datePublished": "2026-04-21T17:43:21.041Z",
    "dateReserved": "2026-04-14T14:07:59.642Z",
    "dateUpdated": "2026-04-22T13:26:03.183Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

GHSA-527G-3W9M-29HV

Vulnerability from github – Published: 2026-04-14 01:08 – Updated: 2026-06-06 00:58

Summary

mitmproxy has an LDAP Injection

Details

Impact

In mitmproxy 12.2.1 and below, the builtin LDAP proxy authentication does not correctly sanitize the username when querying the LDAP server. This allows a malicious client to bypass authentication.

Only mitmproxy instances using the proxyauth option with LDAP are affected. This option is not enabled by default.

Patches

The vulnerability has been fixed in mitmproxy 12.2.2 and above.

Acknowledgements

We thank Yue (Knox) Liu (@yueyueL) for responsibly disclosing this vulnerability to the mitmproxy team.

Timeline

2025-12-08: Received initial report.
2025-12-09: Verified report and confirmed receipt.
2026-01-02: Informed researcher that patch will be part of the next regular patch release.
2026-04-12: Published patch release and advisory.

Severity

4.8 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 12.2.1"
      },
      "package": {
        "ecosystem": "PyPI",
        "name": "mitmproxy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "12.2.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40606"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-90"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-14T01:08:52Z",
    "nvd_published_at": "2026-04-21T18:16:52Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nIn mitmproxy 12.2.1 and below, the builtin LDAP proxy authentication does not correctly sanitize the username when querying the LDAP server. This allows a malicious client to bypass authentication.\n\nOnly mitmproxy instances using the `proxyauth` option with LDAP are affected. This option is not enabled by default.\n\n### Patches\n\nThe vulnerability has been fixed in mitmproxy 12.2.2 and above.\n\n### Acknowledgements\n\nWe thank Yue (Knox) Liu (@yueyueL) for responsibly disclosing this vulnerability to the mitmproxy team.\n\n### Timeline\n\n- **2025-12-08**: Received initial report. \n- **2025-12-09**: Verified report and confirmed receipt.\n- **2026-01-02**: Informed researcher that patch will be part of the next regular patch release.\n- **2026-04-12**: Published patch release and advisory.",
  "id": "GHSA-527g-3w9m-29hv",
  "modified": "2026-06-06T00:58:36Z",
  "published": "2026-04-14T01:08:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/mitmproxy/mitmproxy/security/advisories/GHSA-527g-3w9m-29hv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40606"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/mitmproxy/mitmproxy"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/mitmproxy/PYSEC-2026-92.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mitmproxy has an LDAP Injection"
}

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.

Detection rules are retrieved from Rulezet.

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

PYSEC-2026-92

CVE-2026-40606 (GCVE-0-2026-40606)

GHSA-527G-3W9M-29HV

Impact

Patches

Acknowledgements

Timeline

Tags

Sightings

Nomenclature

Related by attack behaviour