python-ldap — security advisory

{
  "id": "5ad3916c31ba0e0ba6b162b6e88f8e690220efc5fcda76aa52e10b218f45a7de",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-61912",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2025-61912",
    "summary": "python-ldap is a lightweight directory access protocol (LDAP) client API for Python. In versions prior to 3.4.5, ldap.dn.escape_dn_chars() escapes \\x00 incorrectly by emitting a backslash followed by a literal NUL byte instead of the RFC-4514 hex form \\00. Any application that uses this helper to construct DNs from untrusted input can be made to consistently fail before a request is sent to the LDAP server (e.g., AD), resulting in a client-side denial of service. Version 3.4.5 contains a patch for the issue.",
    "evidence": "osv:DEBIAN-CVE-2025-61912",
    "products": [
      {
        "name": {
          "value": "python-ldap",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.4.3-2+deb12u1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.4.3-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-ldap",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.4.4-1+deb13u1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.4.4-1",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "python-ldap",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "3.4.5-1",
            "evidence": "/affected/2/ranges"
          }
        ],
        "affected_versions": [
          {
            "value": "3.4.4-1",
            "evidence": "/affected/2/versions"
          },
          {
            "value": "3.4.4-2",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "DEBIAN-CVE-2025-61912",
      "aliases": [
        "DEBIAN-CVE-2025-61912"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.4.3-2+deb12u1"
                }
              ]
            }
          ],
          "package": {
            "name": "python-ldap",
            "purl": "pkg:deb/debian/python-ldap?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "3.4.3-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61912.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.4.4-1+deb13u1"
                }
              ]
            }
          ],
          "package": {
            "name": "python-ldap",
            "purl": "pkg:deb/debian/python-ldap?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "3.4.4-1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61912.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3.4.5-1"
                }
              ]
            }
          ],
          "package": {
            "name": "python-ldap",
            "purl": "pkg:deb/debian/python-ldap?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "3.4.4-1",
            "3.4.4-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-61912.json"
          },
          "ecosystem_specific": {
            "urgency": "not yet assigned"
          }
        }
      ],
      "modified": "2026-10-23T17:47:43.041776094Z",
      "provider": "osv",
      "upstream": [
        "CVE-2025-61912"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2025-61912"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2025-61912",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 418523,
  "published_at": "2025-10-10T22:15:37.637+00:00"
}