CVE-2026-42577

HIGH

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

Title source: cna
STIX 2.1

Description

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.

References (3)

Core 3

Scores

CVSS v3 7.5
EPSS 0.0041
EPSS Percentile 32.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-772
Status published
Products (3)
io.netty/netty-transport-native-epoll 4.2.0.Final - 4.2.13.FinalMaven
netty/netty 4.2.0 - 4.2.13
netty/netty >= 4.2.0.Final, < 4.2.13.Final
Published May 13, 2026
Tracked Since May 14, 2026