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undertow: undertow-websockets: Undertow: Pre-Auth DoS on websocket endpoint with @ServerEndpoint class with any @OnMessage method

🗓️ 11 Aug 2026 16:41:31Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 4 Views

Pre-Auth DoS in undertow-websockets via @ServerEndpoint with @OnMessage causing Out of Memory.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9noarcheap7-activemq-artemis2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-cli2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-cli-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-commons2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-commons-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-core-client2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-core-client-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-dto2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-dto-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-hornetq-protocol2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-hornetq-protocol-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-hqclient-protocol2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-hqclient-protocol-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-jdbc-store2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-jdbc-store-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-jms-client2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-jms-client-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
Red Hat Enterprise Linux9noarcheap7-activemq-artemis-jms-server2.16.0-22.redhat_00057.1.el9eapeap7-activemq-artemis-jms-server-2.16.0-22.redhat_00057.1.el9eap.noarch.rpm
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18 Sep 2026 17:40Current
CVSS 3.17.5
EPSS0.0051
SSVC
4