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Highest advisory severityHigh 1 vendor · 1 advisory

CVE-2026-15565

CVE-2026-15565: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityHigh7.5

    High [CVE-2026-15565] Pre-Auth DoS on websocket endpoint with @ServerEndpoint class with any @OnMessage method

    CVE-2026-15565Source published Source updated

    A flaw was found in Undertow. A remote attacker can cause Out of Memory on websockets endpoint without authentication on any @ServerEndpoint class that has any @OnMessage method. This allows an attacker to cause Denial of Service attack without authentication and using only a standard WebSocket handshake. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-120. Affected Red Hat products: Red Hat JBoss Enterprise Application Platform 7.4.25; Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7; Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8; Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9; Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10; Red Hat JBoss Enterprise Application Platform…

    Affected products in this advisory
    • Red Hat JBoss Enterprise Application Platform 7.4.25
    • Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
    • Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 8
    • Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 9

    7 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • io.undertow/undertow-websockets-jsr:2.2.40.SP3-redhat-00001
    • eap7-activemq-artemis-0:2.16.0-22.redhat_00057.1.el7eap
    • eap7-glassfish-jsf-0:2.3.14-11.SP11_redhat_00001.1.el7eap
    • eap7-ironjacamar-0:1.5.26-2.Final_redhat_00001.1.el7eap

    43 more entries in the full advisory.

    Mitigation guidance
    • Option 1 — Server-wide configuration to disable websockets handshake: <!-- Remove <websockets/> from standalone.xml servlet-container --> <servlet-container name="default"> <jsp-config/> <!-- <websockets/> ← remove this line entirely --> </servlet-container> isWebsocketsEnabled() returns false → no WebSocket upgrade accepted for any deployment. Option 2 — Per-application configuration to disable websockets handshake: <!-- WEB-INF/jboss-web.xml inside the WAR --> <jboss-web> <enable-websockets>false</enable-websockets> </jboss-web> Only that specific WAR's @ServerEndpoint classes are not registered.
    Full advisory and evidenceOpen source bulletin

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