CVE-2026-59903

Published: Aug 17, 2026Modified: Sep 23, 2026

7.5

Vector

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

Exploitability: 3.9 / Impact: 3.6

Source: NVD

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.

Affected (2)

Products: Netty: Netty

1 product

Configuration A

2 vulnerable

Vulnerable Software	Affected Versions
Netty Netty	version < 4.1.137
Netty Netty	4.2.0 ≤ version < 4.2.17

Related CWEs

Use of Cache Containing Sensitive Information

The code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere.

References (5)

https://github.com/netty/netty/pull/17213

Source: security-advisories@github.com

Issue TrackingPatch

https://github.com/netty/netty/pull/17217

Source: security-advisories@github.com

Issue TrackingPatch

https://github.com/netty/netty/releases/tag/netty-4.1.137.Final

Source: security-advisories@github.com

Release Notes

https://github.com/netty/netty/releases/tag/netty-4.2.17.Final

Source: security-advisories@github.com

Release Notes

https://github.com/netty/netty/security/advisories/GHSA-8c42-7qj2-3j46

Source: security-advisories@github.com

Vendor Advisory

Timeline

No history available yet.