CVE-2026-42577 HIGH

CVE-2026-42577: Netty: epoll transport denial of service via RST on half-closed TCP connection

Vendor Netty
Product netty
Weakness CWE-772
Published May 13, 2026
Last update May 14, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Netty is an asynchronous, event-driven network application framework. From 4.2.0.Final to 4.2.13.Final , Netty's epoll transport fails to detect and close TCP connections that receive a RST after being half-closed, leading to stale channels that are never cleaned up and, in some code paths, a 100% CPU busy-loop in the event loop thread. This vulnerability is fixed in 4.2.13.Final.

Key dates

02Disclosure timeline

May 13, 2026 CVE published
May 14, 2026 Record updated