CVE-2026-42577

EUVD-2026-30120
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 33.69%
Affected Products (NVD)
VendorProductVersion
nettynetty
4.2.0 ≤
𝑥
< 4.2.13
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
netty
bookworm
vulnerable
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
netty
bionic
not-affected
focal
not-affected
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
trusty
not-affected
Common Weakness Enumeration
References
https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d
https://github.com/netty/netty/pull/16689
https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p