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.

Affected Software

Weaknesses

• CWE-116: CWE-116: Improper Encoding or Escaping of Output
• CWE-170: CWE-170: Improper Null Termination

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

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

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