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.
INFO
Published Date :
May 13, 2026, 7:17 p.m.
Last Modified :
May 18, 2026, 2:05 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Netty to version 4.2.13.Final or later.
- Monitor CPU usage after the update.
- Verify stale connections are properly closed.
Public PoC/Exploit Available at Github
CVE-2026-42577 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-42577.
| URL | Resource |
|---|---|
| https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d | Patch |
| https://github.com/netty/netty/pull/16689 | Issue Tracking Patch |
| https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-42577 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-42577
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
An enterprise-grade, microservices-based **Hotel Property Management System**. This platform orchestrates hotel operations — from reservations and guest management to food & beverage point-of-sale, billing, and housekeeping — powered by a modern React frontend and a highly scalable Spring Boot backend ecosystem.
Dockerfile Java TypeScript JavaScript HTML CSS PowerShell Shell Batchfile
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-42577 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-42577 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 18, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:* versions from (including) 4.2.0 up to (excluding) 4.2.13 Added Reference Type GitHub, Inc.: https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/netty/netty/pull/16689 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p Types: Mitigation, Vendor Advisory -
New CVE Received by [email protected]
May. 13, 2026
Action Type Old Value New Value 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-772 Added Reference https://github.com/netty/netty/commit/0ec3d97fab376e243d328ac95fbd288ba0f6e22d Added Reference https://github.com/netty/netty/pull/16689 Added Reference https://github.com/netty/netty/security/advisories/GHSA-rwm7-x88c-3g2p