CVE-2026-93567
Severity CVSS v4.0:
Pending analysis
Type:
CWE-20
Input Validation
Publication date:
18/09/2026
Last modified:
10/10/2026
Description
A flaw was found in Netty's HTTP/2 codec. When converting HTTP/1 CONNECT requests to HTTP/2, the component incorrectly uses the Host header instead of the CONNECT authority-form request-target for the tunnel authority. A remote attacker can exploit this by supplying a different Host header, leading to a malformed HTTP/2 CONNECT request. This can bypass security controls such as tunnel allow-lists or egress policies, resulting in integrity loss.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH