Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-38f8-5428-x5cv Netty vulnerable to HTTP Request Smuggling due to malformed Transfer-Encoding
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 15 May 2026 21:15:00 +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 incorrectly parses malformed Transfer-Encoding, 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 malformed Transfer-Encoding
Weaknesses CWE-444
References
Metrics cvssV3_1

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


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-15T20:34:21.305Z

Reserved: 2026-04-28T17:26:12.086Z

Link: CVE-2026-42585

cve-icon Vulnrichment

Updated: 2026-05-15T20:33:01.224Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-05-13T19:17:24.187

Modified: 2026-05-15T21:16:35.667

Link: CVE-2026-42585

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-14T14:34:03Z

Weaknesses