CVE-2025-61912

python-ldap Vulnerable to Improper Encoding or Escaping of Output and Improper Null Termination

State: Published
Severity: 5.5 Medium
Published: Oct 10, 2025
Updated: Oct 14, 2025
Reserved: Oct 3, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	5.5 Medium	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	GitHub_M

Weaknesses

CWE-116 Improper Encoding or Escaping of Output
CWE-170 Improper Null Termination

Affected Products

Product	Versions
python-ldappython-ldap	< 3.4.5Affected

References

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