{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-15565","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-07-13T05:42:33.770Z","datePublished":"2026-08-11T08:49:58.552Z","dateUpdated":"2026-08-12T15:16:27.017Z"},"containers":{"cna":{"title":"Undertow: undertow-websockets: undertow: pre-auth dos on websocket endpoint with @serverendpoint class with any @onmessage method","metrics":[{"other":{"content":{"value":"Important","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform 7.4.25","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","defaultStatus":"unaffected","packageName":"undertow-websockets-jsr","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:7.4::el7"]},{"vendor":"Red Hat","product":"Red Hat build of Apache Camel for Spring Boot 4","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"undertow-websockets-jsr","defaultStatus":"affected","cpes":["cpe:/a:redhat:camel_spring_boot:4"]},{"vendor":"Red Hat","product":"Red Hat Data Grid 8","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"undertow-websockets-jsr","defaultStatus":"affected","cpes":["cpe:/a:redhat:jboss_data_grid:8"]},{"vendor":"Red Hat","product":"Red Hat Fuse 7","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"undertow-websockets-jsr","defaultStatus":"unknown","cpes":["cpe:/a:redhat:jboss_fuse:7"]},{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform 8","collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","packageName":"undertow-websockets-jsr","defaultStatus":"affected","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8"]},{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform Expansion Pack","collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","packageName":"undertow-websockets-jsr","defaultStatus":"unaffected","cpes":["cpe:/a:redhat:jbosseapxp"]},{"vendor":"Red Hat","product":"Red Hat Single Sign-On 7","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"undertow-websockets-jsr","defaultStatus":"unknown","cpes":["cpe:/a:redhat:red_hat_single_sign_on:7"]}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:53806","name":"RHSA-2026:53806","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-15565","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2490628","name":"RHBZ#2490628","tags":["issue-tracking","x_refsource_REDHAT"]}],"datePublic":"2026-08-11T05:55:42.770Z","problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","workarounds":[{"lang":"en","value":"Option 1 — Server-wide configuration to disable websockets handshake:\n  <!-- Remove <websockets/> from standalone.xml servlet-container -->\n  <servlet-container name=\"default\">\n      <jsp-config/>\n      <!-- <websockets/>  ← remove this line entirely -->\n  </servlet-container>\n  isWebsocketsEnabled() returns false → no WebSocket upgrade accepted for any deployment.\n\nOption 2 — Per-application configuration to disable websockets handshake:\n  <!-- WEB-INF/jboss-web.xml inside the WAR -->\n  <jboss-web>\n      <enable-websockets>false</enable-websockets>\n  </jboss-web>\n  Only that specific WAR's @ServerEndpoint classes are not registered."}],"timeline":[{"lang":"en","time":"2026-06-19T00:58:08.395Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-08-11T05:55:42.770Z","value":"Made public."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-08-12T15:16:27.017Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-11T17:48:42.989579Z","id":"CVE-2026-15565","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-11T17:51:04.542Z"}}]}}