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[USN-8344-3] pip vulnerability

Posted on 03 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8344-3
June 03, 2026

python-pip vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

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

Summary:

A regression was fixed in pip.

Software Description:
- python-pip: Python package installer

Details:

USN-8344-1 introduced a regression in pip. This update provides a complete fix for this issue..

We apologize for the inconvenience.

Original advisory details:

It was discovered that pip's bundled urllib3 library improperly
handled streaming decompression of highly compressed data. A remote
attacker could possibly use this issue to cause pip to consume excessive resources,
leading to a denial of service. (CVE-2025-66471)

Update instructions:

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

Ubuntu 26.04 LTS
python3-pip 25.1.1+dfsg-1ubuntu2+esm3
Available with Ubuntu Pro
python3-pip-whl 25.1.1+dfsg-1ubuntu2+esm3
Available with Ubuntu Pro

Ubuntu 24.04 LTS
python3-pip 24.0+dfsg-1ubuntu1.3+esm3
Available with Ubuntu Pro
python3-pip-whl 24.0+dfsg-1ubuntu1.3+esm3
Available with Ubuntu Pro

Ubuntu 22.04 LTS
python3-pip 22.0.2+dfsg-1ubuntu0.7+esm3
Available with Ubuntu Pro
python3-pip-whl 22.0.2+dfsg-1ubuntu0.7+esm3
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8344-3
https://ubuntu.com/security/notices/USN-8344-2
https://ubuntu.com/security/notices/USN-8344-1
CVE-2025-66471

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