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undertow: undertow-websockets: Undertow: Pre-Auth DoS on websocket endpoint with @ServerEndpoint class with any @OnMessage method

🗓️ 11 Aug 2026 17:41:19Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

Undertow pre-auth OOM DoS on websocket endpoint with @OnMessage method via standard handshake.

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21 Aug 2026 08:45Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.17.5
EPSS0.00476
SSVC
4