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CVE-2026-59903 Details

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.http.cors.CorsHandler setVaryHeader replaces application Vary headers such as Authorization or Cookie with Origin, allowing a caching proxy or CDN to reuse authenticated responses across users and disclose sensitive information. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CNA: [email protected]CVSS-B:6.5 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/netty/netty/pull/17213	[email protected]	Issue TrackingPatch
https://github.com/netty/netty/pull/17217	[email protected]	Issue TrackingPatch
https://github.com/netty/netty/releases/tag/netty-4.1.137.Final	[email protected]	Release Notes
https://github.com/netty/netty/releases/tag/netty-4.2.17.Final	[email protected]	Release Notes
https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46	[email protected]	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-524	Use of Cache Containing Sensitive Information	[email protected]

Affected Products

Product	Versions
netty netty	< 4.1.137 >= 4.2.0, < 4.2.17
CPE cpe:2.3:a:netty:netty:::::::: Remediation No remediation found in references.

Change History

3 change records found show changes

Date	Action	Recorded By
Sep 23, 2026	Initial Analysis	[email protected]
Aug 17, 2026	CVE Modified	CISA-ADP
Aug 17, 2026	New CVE Received	[email protected]