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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.

PUBLISHED Reserved 2026-04-28 | Published 2026-05-13 | Updated 2026-05-15 | Assigner GitHub_M




MEDIUM: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem types

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Product status

>= 4.2.0.Alpha1, < 4.2.13.Final
affected

< 4.1.133.Final
affected

>= 4.2.0.Alpha1, < 4.2.13.Final
affected

< 4.1.133.Final
affected

References

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

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

cve.org (CVE-2026-42585)

nvd.nist.gov (CVE-2026-42585)

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