CVE-2025-61912: Python-LDAP

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

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 Python-LDAP: before 3.4.5 (fixed in 3.4.5)

Published 2025-10-10. Last modified 2026-06-17.