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CVE-2026-5680

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

A flaw was found in Undertow. A remote attacker could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application.

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 2

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 14:15
  2. First seenCVSS 7.5NVD modified 2026-10-14 16:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 6