Is CVE-2026-42577 actively exploited?

No active exploitation of CVE-2026-42577 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42577 be exploited remotely?

Yes. CVE-2026-42577 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42577?

CVE-2026-42577 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-42577

HIGH

CVE-2026-42577

CWE-772Published: May 13, 2026· Updated: May 18, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-42577 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.