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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

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.Alpha1, < 4.2.13.Final affected —
< 4.1.133.Final affected —
io.netty netty-codec-http affected
Version Status Constraints
>= 4.2.0.Alpha1, < 4.2.13.Final affected —
< 4.1.133.Final affected —

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Project Subscriptions

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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.

References
Link Providers
https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv 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. 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: 2026-05-13T18:13:17.497Z

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

Link: CVE-2026-42585

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-42585

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses