Netty: HTTP Request Smuggling due to malformed Transfer-Encoding_CVE-2026-42585

6.5 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Basic Information

ID CVE-2026-42585

Source GitHub_M

Published May 13, 2026 at 18:12

Modified May 13, 2026 at 18:13

Affected Product

Vendor netty

Product netty

Version >= 4.2.0.Alpha1, < 4.2.13.Final

Affected Versions netty netty >= 4.2.0.Alpha1, < 4.2.13.Final
netty netty < 4.1.133.Final
io.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final
io.netty netty-codec-http < 4.1.133.Final

CWE Classification

CWE-444

References

github.com /netty/netty/security/advisories/GHSA-38f8-5428-x5cv

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