VulnerabilityAnalyzed
CVE-2026-42577
This vulnerability is fixed in 4.2.13.Final.
HIGH 7.5EPSS 0.41%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.41%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.41% probability · 34th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-772
- Affected
- netty/netty
- Source
- security-advisories@github.com
References
- https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22dPatch
- https://github.com/netty/netty/pull/16689Issue Tracking, Patch
- https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2pMitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.