Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
History

Thu, 14 May 2026 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 14 May 2026 15:00:00 +0000

Type Values Removed Values Added
First Time appeared Io.netty
Io.netty netty-codec-http
Netty
Netty netty
Vendors & Products Io.netty
Io.netty netty-codec-http
Netty
Netty netty

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

Type Values Removed Values Added
Description Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's chunk size parser silently overflows int, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Title Netty: HTTP Request Smuggling due to incorrect chunk size parsing
Weaknesses CWE-190
CWE-444
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-05-13T18:04:03.690Z

Updated: 2026-05-14T18:21:13.322Z

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

Link: CVE-2026-42580

cve-icon Vulnrichment

Updated: 2026-05-14T18:21:01.939Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-05-13T19:17:23.490

Modified: 2026-05-14T19:16:35.967

Link: CVE-2026-42580

cve-icon Redhat

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