{"cve":"CVE-2026-42577","nvd":{"published":"2026-05-13T19:17:23.063","modified":"2026-06-17T10:48:04.040","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-772"],"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"],"products":["netty:netty"],"source":"nvd","synced_at":"2026-10-19T22:35:16.954578616+00:00"},"epss":{"cve":"CVE-2026-42577","score":0.00408,"percentile":0.35093,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-rwm7-x88c-3g2p","url":"https://osv.dev/vulnerability/GHSA-rwm7-x88c-3g2p","summary":"Netty epoll transport denial of service via RST on half-closed TCP connection","modified":"2026-09-10T03:50:47.593221129Z","packages":[{"ecosystem":"Maven","name":"io.netty:netty-transport-classes-epoll","purl":"pkg:maven/io.netty/netty-transport-classes-epoll","ranges":[">=4.2.0.Final <4.2.13.Final"],"fixed":["4.2.13.Final"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}