Source: python-h2 Version: 4.2.0-1 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-2025-57804[0]: | h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior | to version 4.3.0, an HTTP/2 request splitting vulnerability allows | attackers to perform request smuggling attacks by injecting CRLF | characters into headers. This occurs when servers downgrade HTTP/2 | requests to HTTP/1.1 without properly validating header | names/values, enabling attackers to manipulate request boundaries | and bypass security controls. This issue has been patched in version | 4.3.0. 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-2025-57804 https://www.cve.org/CVERecord?id=CVE-2025-57804 [1] https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h [2] https://github.com/python-hyper/h2/commit/035e9899f95e3709af098f578bfc3cd302298e3a Please adjust the affected versions in the BTS as needed. Regards, Salvatore
