What’s Vulnerable › Vulnerabilities

CVE-2025-61912: python-ldap Vulnerable to Improper Encoding or Escaping of Output and Improper Null Termination

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-10-10 · updated 2026-10-19
• Weakness: CWE-116

Description

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.

Affected products

• python-ldap: before 3.4.5 — fixed in 3.4.5

How to fix

Upgrade to a fixed version: python-ldap 3.4.5. Check the vendor advisory for mitigations.

References

• https://github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49a3f
• https://github.com/python-ldap/python-ldap/releases/tag/python-ldap-3.4.5
• https://github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6

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