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[USN-8379-1] urllib3 vulnerabilities

Posted on 03 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8379-1
June 03, 2026

python-urllib3 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in urllib3.

Software Description:
- python-urllib3: HTTP library with thread-safe connection pooling

Details:

It was discovered that urllib3 incorrectly handled cross-origin redirects
in ProxyManager. A remote attacker could possibly use this issue to obtain
sensitive information. (CVE-2026-44431)

It was discovered that urllib3 incorrectly handled decompression of
specially crafted responses. A remote attacker could possibly use this
issue to cause urllib3 to consume resources, leading to a denial of
service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-44432)

Update instructions:

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

Ubuntu 26.04 LTS
python3-urllib3 2.6.3-1ubuntu1.1

Ubuntu 25.10
python3-urllib3 2.3.0-3ubuntu0.6

Ubuntu 24.04 LTS
python3-urllib3 2.0.7-1ubuntu0.7

Ubuntu 22.04 LTS
python3-urllib3 1.26.5-1~exp1ubuntu0.7

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

References:
https://ubuntu.com/security/notices/USN-8379-1
CVE-2026-44431, CVE-2026-44432

Package Information:
https://launchpad.net/ubuntu/+source/python-urllib3/2.6.3-1ubuntu1.1
https://launchpad.net/ubuntu/+source/python-urllib3/2.3.0-3ubuntu0.6
https://launchpad.net/ubuntu/+source/python-urllib3/2.0.7-1ubuntu0.7
https://launchpad.net/ubuntu/+source/python-urllib3/1.26.5-1~exp1ubuntu0.7

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