VULNERABILITY INTELLIGENCE
CVE-2026-5680
CVSS score7.5 HIGH
EPSS probability1.10%
CISA KEVNot currently listed
Published2026-08-27
Last modified2026-10-20
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
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.
Weakness classification
- CWE-770: Allocation of Resources Without Limits or Throttling