Special Element Injection Affecting python-ldap package, versions <2.4.22-0.1ubuntu0.1~esm1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.06% (19th percentile)

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  • Snyk IDSNYK-UBUNTU1604-PYTHONLDAP-13570005
  • published21 Oct 2025
  • disclosed10 Oct 2025

Introduced: 10 Oct 2025

CVE-2025-61911  (opens in a new tab)
CWE-75  (opens in a new tab)
CWE-843  (opens in a new tab)

How to fix?

Upgrade Ubuntu:16.04 python-ldap to version 2.4.22-0.1ubuntu0.1~esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-ldap package and not the python-ldap package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

python-ldap is a lightweight directory access protocol (LDAP) client API for Python. In versions prior to 3.4.5, the sanitization method ldap.filter.escape_filter_chars can be tricked to skip escaping of special characters when a crafted list or dict is supplied as the assertion_value parameter, and the non-default escape_mode=1 is configured. The method ldap.filter.escape_filter_chars supports 3 different escaping modes. escape_mode=0 (default) and escape_mode=2 happen to raise exceptions when a list or dict object is supplied as the assertion_value parameter. However, escape_mode=1 computes without performing adequate logic to ensure a fully escaped return value. If an application relies on the vulnerable method in the python-ldap library to escape untrusted user input, an attacker might be able to abuse the vulnerability to launch ldap injection attacks which could potentially disclose or manipulate ldap data meant to be inaccessible to them. Version 3.4.5 fixes the issue by adding a type check at the start of the ldap.filter.escape_filter_chars method to raise an exception when the supplied assertion_value parameter is not of type str.

CVSS Base Scores

version 3.1