CVE-2026-42577

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

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.

Scores

Weaknesses (CWE)

• CWE-772

Advisories

• GHSA-rwm7-x88c-3g2p — Netty epoll transport denial of service via RST on half-closed TCP connection

European references

• ENISA EUVD · EUVD-2026-30120
• GCVE · GCVE-0-2026-42577

CERT-FR advisories

• CERTFR-2026-AVI-1378 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1206 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
• CERTFR-2026-AVI-1165 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

• cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* ≥ 4.2.0 < 4.2.13

Affected products

References

• https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p
• https://github.com/netty/netty/pull/16689
• https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d

Sources