High severity7.5NVD Advisory· Published Aug 27, 2026
CVE-2026-5680
CVE-2026-5680
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.
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Affected products
1Patches
Vulnerability mechanics
References
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