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CVE-2026-59898

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-59898

Severity

Unknown
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Summary

Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation

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.

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