CVE-2026-15565
Severity CVSS v4.0:
Pending analysis
Type:
CWE-120
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Publication date:
11/08/2026
Last modified:
11/08/2026
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.
Impact
Base Score 3.x
7.50
Severity 3.x
HIGH