ELA-1761-1 python-urllib3 security update

information disclosure

2026-06-27
Packagepython-urllib3
Version1.19.1-1+deb9u5 (stretch), 1.24.1-1+deb10u6 (buster)
Related CVEs CVE-2026-44431


It was discovered that python-urllib3, did not strip out sensitive headers (such as Authorization or Cookie) during cross-origin redirects followed from the low-level API. The issue may lead to information disclosure or authorization bypass.

The issue stems from an incomplete fix for CVE-2018-20060.



For Debian 10 buster, these problems have been fixed in version 1.24.1-1+deb10u6.

For Debian 9 stretch, these problems have been fixed in version 1.19.1-1+deb9u5.

We recommend that you upgrade your python-urllib3 packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.