CVE-2026-93569
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Summary
A flaw was found in Netty. A remote unauthenticated attacker can exploit a vulnerability in Netty's HTTP/1 to HTTP/2 conversion process. When an HTTP/1 request includes both an absolute-form request-target and a conflicting Host header, Netty incorrectly prioritizes the Host header for the HTTP/2 :authority field, discarding the original request-target authority. This inconsistency can allow an attacker to bypass security controls in Netty-based proxies or gateways, potentially leading to unauthorized access, cache poisoning, or misrouting of requests.
Affected Software
| Vendor | Product | Version Range | Status |
|---|
Weaknesses
- CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Workarounds
See https://github.com/netty/netty/security/advisories/GHSA-cg2g-fxr4-mg8m for fixed versions and remediation guidance.
References
- https://access.redhat.com/security/cve/CVE-2026-93569
- https://bugzilla.redhat.com/show_bug.cgi?id=2536962
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