Denial of Service Vulnerability in python-ldap Client API by Python
CVE-2025-61912

5.5MEDIUM

Key Information:

Vendor: Python-ldap
Status: Python-ldap
Vendor: CVE Published:; 10 October 2025

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What is CVE-2025-61912?

The python-ldap client API for Python, specifically versions prior to 3.4.5, contains a vulnerability in the ldap.dn.escape_dn_chars() function. This function improperly escapes NULL bytes by emitting a backslash followed by a literal NUL byte instead of the appropriate RFC-4514 hex representation. As a result, any application utilizing this function with untrusted input can face consistent failures before sending requests to LDAP servers, such as Active Directory. The issue has been addressed in version 3.4.5 with a patch provided to mitigate the risks.

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