CVE-2026-42580

PoC —

CVSS 3.1

6.5 medium

EPSS

<1%p30

Published

May 13, 2026 (May 13, 2026)

Modified

Jun 17, 2026

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Vendors: netty
Products: netty
Weakness: CWE-190, CWE-444
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

NVD CVE.org GitHub PoCs EPSS (0.4%)

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