CVE-2025-61911

Publication date 10 October 2025

Last updated 20 October 2025

Ubuntu priority

Medium

Why this priority?

Description

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`.

Status

Package Ubuntu Release Status
python-ldap 25.10 questing
Fixed 3.4.4-1ubuntu0.25.10.1
25.04 plucky
Fixed 3.4.4-1ubuntu0.25.04.1
24.04 LTS noble
Fixed 3.4.4-1ubuntu0.24.04.1
22.04 LTS jammy
Fixed 3.2.0-4ubuntu7.2
20.04 LTS focal
Fixed 3.2.0-4ubuntu2.1+esm1
18.04 LTS bionic
Fixed 3.0.0-1ubuntu0.2+esm1
16.04 LTS xenial
Fixed 2.4.22-0.1ubuntu0.1~esm1

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References

Related Ubuntu Security Notices (USN)

    • USN-7828-1
    • Python LDAP vulnerabilities
    • 20 October 2025

Other references