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Alerts This Week
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Debian 11 DLA-4446-1 Python-urllib3 Important Decompression Bomb DoS

debian lts
Calendar Grey January 23, 2026
Dist Debian Esm H88
A security update for python-urllib3 fixes a DoS vulnerability in Debian 11, ensuring safe HTTP connection pooling.
It was discovered that python-urllib3, an HTTP library with thread-safe connection pooling for Python, was vulnerable to decompression bomb when following HTTP redirects via the st...
Topics%20covered

Topics Covered

security advisory denial of service security update debian important python-urllib3

Summary

For Debian 11 bullseye, this problem has been fixed in version
1.26.5-1~exp1+deb11u3.

We recommend that you upgrade your python-urllib3 packages.

For the detailed security status of python-urllib3 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/python-urllib3

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS



Severity
important
Lowest
Low
Medium
High
Critical

Package: python-urllib3
Version: 1.26.5-1~exp1+deb11u3
CVE ID: CVE-2026-21441
Debian Bug: 1125062

Topics%20covered

Topics Covered

security advisory denial of service security update debian important python-urllib3

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