CVE-2025-57804

Published: August 28, 2025Last modified: September 2, 2025

Description

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.

Status

References

• https://github.com/python-hyper/h2/commit/035e9899f95e3709af098f578bfc3cd302298e3a
• https://github.com/python-hyper/h2/security/advisories/GHSA-847f-9342-265h