CVE-2025-61911 python-ldap has sanitization bypass in ldap.filter.escape_filter_chars
Attackers can bypass LDAP filter sanitization in python-ldap to inject queries and access or modify unauthorized directory data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-61911?
CVE-2025-61911 is a medium-severity vulnerability in python-ldap, published on 10 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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`.
Which versions are affected by CVE-2025-61911?
3 open source packages ship an affected version, including python-ldap. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
python-ldap PyPI | All versions | 3.4.5 |
python-ldap PyPI | All versions | 3.4.5 |
python-ldap PyPI | All versions | 3.4.5 |
Products include Python-Ldap Python-Ldap.
How do I fix CVE-2025-61911?
Upgrade python-ldap to 3.4.5 or later.
Is CVE-2025-61911 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-61911 exists.
Other vulnerabilities in python-ldap
Sources
Also known as AZL-68430, AZL-68451, DEBIAN-CVE-2025-61911, ECHO-f6d8-9d6f-c927, GHSA-r7r6-cc7p-4v5m, OESA-2025-2683 and 2 more.