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.
Problem types
CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')
Product status
References
github.com/...per/h2/security/advisories/GHSA-847f-9342-265h
github.com/...ommit/035e9899f95e3709af098f578bfc3cd302298e3a
