CVE-2025-61912
MEDIUM5.3EPSS 0.14%python-ldap is Vulnerable to Improper Encoding or Escaping of Output and Improper Null Termination
Published: 10/10/2025Modified: 5/16/2026
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.
Affected packages (2)
- Debian/python-ldapfrom 0
- PyPI/python-ldapfrom 0, < 3.4.5
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P |
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
References (6)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-61912
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2025-61912
- PATCHhttps://github.com/python-ldap/python-ldap
- WEBhttps://github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49a3f
- WEBhttps://github.com/python-ldap/python-ldap/releases/tag/python-ldap-3.4.5
- WEBhttps://github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6