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Debian LTS python-urllib3 Serious Information Leak Resolution DLA-4651-1

debian lts
Calendar Grey June 26, 2026
Dist Debian Esm H88
Debian LTS security advisory for python-urllib3 related to sensitive headers during cross-origin redirects. Upgrade recommended.
It was discovered that python-urllib3, an HTTP library with thread-safe connection pooling for Python, did not strip out sensitive headers (such as `Authorization` or `Cookie`) dur...
Topics%20covered

Topics Covered

security advisory critical information disclosure authorization bypass python-urllib3 deblts

Summary

For Debian 11 bullseye, this problem has been fixed in version
1.26.5-1~exp1+deb11u4.

For Debian 12 bookworm, this problem has been fixed in version
1.26.12-1+deb12u4.

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/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
critical
Lowest
Low
Medium
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Critical

Package: python-urllib3
Version: 1.26.5-1~exp1+deb11u4 1.26.12-1+deb12u4
CVE ID: CVE-2026-44431
Debian Bug: 1136653

Topics%20covered

Topics Covered

security advisory critical information disclosure authorization bypass python-urllib3 deblts

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