Vulnerabilities CVE-2026-15565

CVE-2026-15565

High

Open

TLP:CLEAR

Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method

NVD CVE.org

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Description

A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.38%

30.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Aug 11, 2026
Last Modified: Aug 11, 2026

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