Inconsistent interpretation of HTTP requests in Netty - CVE-2026-42585
Published: May 5, 2026
Vulnerability identifier: #VU130210
CSH Severity: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-42585
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Netty
Netty
Software vendor:
Netty project
Netty project
Description
The vulnerability allows a remote attacker to inject arbitrary HTTP requests.
The vulnerability exists due to inconsistent interpretation of HTTP requests in HttpRequestDecoder when parsing malformed Transfer-Encoding headers. A remote attacker can send a specially crafted HTTP request with a malformed "Transfer-Encoding: chunked, identity" header to inject arbitrary HTTP requests.
Exploitation is possible in deployments where a proxy forwards such malformed requests to Netty instead of rejecting them.
Remediation
Install security update from vendor's website.