🛡️ CVE-2026-42581
🟡 CVSS 5.8 — Medium ✅ No Known Exploit CWE-444 NVD
5.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Details

Severity Medium
CVSS Score 5.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE CWE-444
Public Exploit ✅ No
Source NVD
Published 2026-05-07
Updated 2026-06-15
Modified 2026-05-14
Fix URL N/A

Affected Packages

Software From version Fixed in
io.netty:netty-codec-http — 4.1.133.Final
netty 4.2.0 4.2.13
unknown — —

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