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.
Details
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| python-h2 | — | — |
References
Similar Threats
- Unknown openSUSE-SU-2026:20122-1
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- Unknown SUSE-SU-2025:03273-1
- Medium OESA-2025-2250
- Unknown SUSE-SU-2025:03199-1
Exploit Protection
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