CVE-2026-42584

CRITICAL EPSS 34.1%

Published May 13, 20261mo ago · Modified Jun 17, 20261w ago

9.1 CVSS 3.1

Critical

Published May 13, 2026 1mo ago

Last Modified Jun 17, 2026 1w ago

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpClientCodec pairs each inbound response with an outbound request by queue.poll() once per response, including for 1xx. If the client pipelines GET then HEAD and the server sends 103, then 200 with GET body, then 200 for HEAD, the queue pairs HEAD with the first 200. The HEAD rule then skips reading that message’s body, so the GET entity bytes stay on the stream and the following 200 is parsed from the wrong offset. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

CVSS Details

Base Score

9.1

Exploitability

3.9

Impact

5.2

Vector string

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope Unchanged

Confidentiality None

Integrity High

Availability High

Threat Intelligence

EPSS Exploit Probability

34.1% percentile

Exploit & Patch Status

Public Exploit Known

No Patch Available

Weaknesses 1

CWE-444

Affected Products 2

Vendor	Product	Version	Range
netty	netty	*	<4.1.133
netty	netty	*	≥4.2.0 – <4.2.13

References 1

github.com https://github.com/netty/netty/security/advisories/GHSA-57rv-r2g8-2cj3

ExploitVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.