Bug 2524190

Summary: CVE-2026-59898 byte-buddy: Netty: Protocol version confusion in netty-codec-http (WebSocket) [fedora-all]
Product: [Fedora] Fedora Reporter: Jon Weiser <jweiser>
Component: byte-buddyAssignee: Marián Konček <mkoncek>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: mizdebsk, mkoncek
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["c0c99f26-ea66-4740-a552-888ac69a9ae2"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2507479    

Description Jon Weiser 2026-08-25 22:42:17 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Netty is a network application framework for development of protocol servers and clients. Prior to 4.1.136.Final, the WebSocket handshaker in netty-codec-http fails to properly validate protocol version information during the WebSocket upgrade process. An attacker can exploit this confusion to bypass security checks or negotiate unexpected protocol versions, potentially leading to protocol-level attacks. This issue is fixed in versions 4.1.136.Final and later.