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CVE-2025-61912

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Date: October 10, 2025

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.

Severity Score

Related Resources (6)

https://github.com/python-ldap/python-ldap/releases/tag/python-ldap-3.4.5
https://nvd.nist.gov/vuln/detail/CVE-2025-61912
https://github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49a3f
https://github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6
https://github.com/python-ldap/python-ldap
https://www.mend.io/vulnerability-database/CVE-2025-61912

Severity Score

Weakness Type (CWE)

Improper Encoding or Escaping of Output

CWE-116

Improper Null Termination

CWE-170

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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