CVE-2026-81624
High · 7.5CVSS
7.5
EPSS
0.6%
Published
Aug 31, 2026
CISA due date
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The record
Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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