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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
netty netty affected
Version Status Constraints
>= 4.2.0.Final, < 4.2.13.Final affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-rwm7-x88c-3g2p Netty epoll transport denial of service via RST on half-closed TCP connection
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d cve-icon cve-icon
https://github.com/netty/netty/pull/16689 cve-icon cve-icon
https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p cve-icon cve-icon
History

Wed, 13 May 2026 18:30:00 +0000

Type Values Removed Values Added
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.
Title Netty: epoll transport denial of service via RST on half-closed TCP connection
Weaknesses CWE-772
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-13T18:00:28.744Z

Reserved: 2026-04-28T17:26:12.085Z

Link: CVE-2026-42577

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-13T19:17:23.063

Modified: 2026-05-13T19:17:23.063

Link: CVE-2026-42577

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-13T19:45:03Z

Weaknesses