CVE ID : CVE-2025-57804
Published : Aug. 25, 2025, 9:15 p.m. | 4 hours, 41 minutes ago
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.
Severity: 6.9 | MEDIUM
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