Source: python-h2 Version: 4.3.0-2 Severity: important Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
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
