Inconsistent interpretation of HTTP requests in Netty - #VU148883
Published: September 10, 2026
Vulnerability identifier: #VU148883
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass routing and access-control decisions based on the request authority.
The vulnerability exists due to inconsistent interpretation of HTTP requests in Netty\'s HTTP/3 codec when processing a HEADERS frame containing conflicting :authority and host header values. A remote attacker can send a crafted HEADERS frame with differing authority values to bypass routing and access-control decisions based on the request authority.
Different components in the request path may consult different authority fields.
Affected software
Netty
Remediation
Install security update from vendor's website.
Netty - update to 4.2.18