high7.5
CVE-2026-42577
Netty epoll transport denial of service via RST on half-closed TCP connection
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | io.netty:netty-transport-classes-epoll | >= 4.2.0.Final, < 4.2.13.Final | 4.2.13.Final |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Netty | Netty | from 4.2.0 before 4.2.13 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-rwm7-x88c-3g2p
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-42577