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

CVE ID : CVE-2025-61912

Published : Oct. 10, 2025, 10:15 p.m. | 23 minutes ago

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 0. 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: 5.5 | MEDIUM

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