[USN-7828-1] Python LDAP vulnerabilities

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Ubuntu Security Notice USN-7828-1
October 20, 2025

python-ldap vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Python LDAP.

Software Description:
- python-ldap: LDAP interface module for Python

Details:

It was discovered that Python LDAP incorrectly handled special characters
in the special character filtering function. A remote attacker could
possibly use this issue to perform LDAP injection attacks.
(CVE-2025-61911)

Arad Inbar discovered that Python LDAP incorrectly escaped NUL character
bytes. An attacker could possibly use this issue to cause a denial of
service. (CVE-2025-61912)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
python3-ldap 3.4.4-1ubuntu0.25.10.1

Ubuntu 25.04
python3-ldap 3.4.4-1ubuntu0.25.04.1

Ubuntu 24.04 LTS
python3-ldap 3.4.4-1ubuntu0.24.04.1

Ubuntu 22.04 LTS
python3-ldap 3.2.0-4ubuntu7.2

Ubuntu 20.04 LTS
python3-ldap 3.2.0-4ubuntu2.1+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
python-ldap 3.0.0-1ubuntu0.2+esm1
Available with Ubuntu Pro
python3-ldap 3.0.0-1ubuntu0.2+esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
python-ldap 2.4.22-0.1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7828-1
CVE-2025-61911, CVE-2025-61912

Package Information:
https://launchpad.net/ubuntu/+source/python-ldap/3.4.4-1ubuntu0.25.10.1
https://launchpad.net/ubuntu/+source/python-ldap/3.4.4-1ubuntu0.25.04.1
https://launchpad.net/ubuntu/+source/python-ldap/3.4.4-1ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/python-ldap/3.2.0-4ubuntu7.2