← Vulnerability feed

Vulnerability record · CVE-2026-42577 · published 13 May 2026

CVE-2026-42577: Netty vulnerability

Netty · Netty

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.

7.5 CVSS 3.1 High EPSS 0.58% · top 54.3% CWE-772 · CWE-772
7.5CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d Patch
https://github.com/netty/netty/pull/16689 Issue TrackingPatch
https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p MitigationVendor Advisory

Track CVE-2026-42577 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2023-44487HTTP/2 Rapid Reset stream cancellation denial of serviceThe HTTP/2 protocol permits a client to cancel many streams quickly, and the server's handling of those resets consumes disproportionate resources. T…KEVEPSS 100%analysed10.0CVE-2026-47691Netty insufficient verification of data authenticity vulnerabilityNetty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's `…EPSS 0.36%10.0CVE-2026-45674Netty insufficient verification of data authenticity vulnerabilityNetty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's D…EPSS 0.36%9.8CVE-2026-42581Netty http request smuggling vulnerabilityNetty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting…EPSS 0.68%9.1CVE-2026-75595Netty vulnerabilityNetty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHand…EPSS 0.46%9.1CVE-2026-56820Netty improper certificate validation vulnerabilityNetty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4…EPSS 0.31%9.1CVE-2026-42584Netty http request smuggling vulnerabilityNetty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound res…EPSS 0.72%9.1CVE-2026-42579Netty improper input validation vulnerabilityNetty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC…EPSS 0.85%

Source: NIST National Vulnerability Database (record CVE-2026-42577), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.