python-ldap has sanitization bypass in ldap.filter.escape_filter_chars

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.5 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P · score source

EPSS

• CVE-2025-61911: 0.32% estimated exploitation activity in the next 30 days; percentile 25.00 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The sanitization method ldap.filter.escapefilterchars can be tricked to skip escaping of special characters when a crafted list or dict is supplied as the assertionvalue parameter, and the non-default escapemode=1 is configured. Details The method ldap.filter.escapefilterchars supports 3 different escaping modes. escapemode=0 (default) and escapemode=2 happen to raise exceptions when a list or dict object is supplied as the assertionvalue parameter. However, escapemode=1 happily computes without performing adequate logic to ensure a fully escaped return value. PoC Exploitable Not exploitable Impact 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. With Python being a dynamically typed language, and the commonly used JSON format supporting list…

Published by the source

10 Oct 2025, 22:51 UTC

Last modified by the source

10 Sep 2026, 03:50 UTC

Source last checked

26 Oct 2026, 13:35 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-r7r6-cc7p-4v5m

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-r7r6-cc7p-4v5m

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# Patch Next advisory brief: CVE-2025-61911

Advisory: python-ldap has sanitization bypass in ldap.filter.escape_filter_chars
IDs: CVE-2025-61911, GHSA-r7r6-cc7p-4v5m
Record: https://patchnext.com/advisories/cve-2025-61911 (revision 3, source checked 26 Oct 2026, 13:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: python-ldap 3.4.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI python-ldap: affected < 3.4.5; fixed in 3.4.5

## Suggested inspection (read-only)
- `python -m pip show python-ldap`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on python-ldap.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-r7r6-cc7p-4v5m (OSV record GHSA-r7r6-cc7p-4v5m lists affected ranges: PyPI python-ldap >=0 <3.4.5 (fixed))
- Verified: https://github.com/advisories/GHSA-r7r6-cc7p-4v5m (GitHub-reviewed advisory GHSA-r7r6-cc7p-4v5m lists affected ranges: PyPI python-ldap >=0 <3.4.5)

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