CVE-2026-93569High· 8.2▾ TwilightA 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, …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 19.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Last analysed / modified upstream
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-93574Medium· 6.5A flaw was found in Netty's `netty-codec-http` component
CVE-2026-93579Medium· 6.5A flaw was found in Netty's HTTP/2 stack
CVE-2026-93573Medium· 6.5A flaw was found in Netty's HTTP/1.1 decoder
CVE-2026-93567High· 7.5A flaw was found in Netty's HTTP/2 codec
CVE-2026-93568High· 7.5A flaw was found in Netty
CVE-2026-93492Medium· 5.3A flaw was found in Netty's HTTP/2 HpackEncoder