Hi,

The following vulnerability was published for python-h2.

CVE-2026-71554[0]:
| h2 is a pure-Python implementation of a HTTP/2 protocol stack.
| Versions up to and including 4.4.0 accept request header blocks
| containing more than one Host header, and forward every Host header
| to the consuming application. Where the consumer downgrades HTTP/2
| to HTTP/1.1, the resulting request carries two Host header lines,
| providing a request smuggling primitive. This issue is fixed in
| version 4.4.1.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-71554
https://www.cve.org/CVERecord?id=CVE-2026-71554
[1] https://github.com/python-hyper/h2/security/advisories/GHSA-6hr6-w5qg-qmwg
[2] https://github.com/python-hyper/h2/commit/292a40829feefda98c8509dcdbbb4a57af9bd6a6

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore