CVE-2025-61912

Name	CVE-2025-61912
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-ldap (PTS)	bullseye	3.2.0-4	vulnerable
	bookworm	3.4.3-2	vulnerable
	forky, sid, trixie	3.4.4-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-ldap	source	(unstable)	(unfixed)

Notes

https://github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6
https://github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49a3f (main)
https://github.com/python-ldap/python-ldap/commit/9f5b2effbafdf7af0e7064a7aa42d2739d373bd7 (python-ldap-3.4.5)