{"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": "2026-08-11T08:49:58.552Z"}, "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 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 7", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-websockets-jsr", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:jboss_enterprise_application_platform: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/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 \u2014 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/> \u2190 remove this line entirely -->\n </servlet-container>\n isWebsocketsEnabled() returns false \u2192 no WebSocket upgrade accepted for any deployment.\n\nOption 2 \u2014 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": "2026-08-11T08:49:58.552Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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