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CVE-2026-15565

7.5 high SSVC exploitation: none Published
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 6

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-21 09:30
  2. StatusPublished → Awaiting AnalysisNVD modified 2026-10-21 10:16
  3. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 19:19
  4. StatusPublished → Awaiting AnalysisNVD modified 2026-10-20 20:17
  5. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 14:22
  6. First seenCVSS 7.5NVD modified 2026-10-15 17:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 10