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CVE-2026-59898

MEDIUM
6.3
CVSS Severity Score
EPSS Score0.0000%
EPSS Percentile0.00th
Published2026-07-29
Last Modified2026-07-29
Data SourcesNVD

Vulnerability Description

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, ab attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending `Sec-WebSocket-Version: 7` and omitting `Connection: Upgrade` / `Upgrade: websocket` headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.

Affected Platforms (CPE)

No CPE configurations currently published for this record.

References & Advisories

🔗 https://github.com/netty/netty/releases/tag/netty-4.1.136.Final
🔗 https://github.com/netty/netty/releases/tag/netty-4.2.16.Final
🔗 https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg

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