CVE-2026-93569
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
18/09/2026
Last modified:
10/10/2026
Description
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.
Impact
Base Score 3.x
8.20
Severity 3.x
HIGH