{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-5680", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-04-06T09:46:16.983Z", "datePublished": "2026-08-27T16:25:29.103Z", "dateUpdated": "2026-08-27T16:25:29.103Z" }, "containers": { "cna": { "title": "Undertow-core: undertow: denial of service via websocket permessage-deflate processing", "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 could exploit this vulnerability by sending specially crafted WebSocket messages with permessage-deflate negotiated. This could lead to excessive memory consumption due to the PerMessageDeflateFunction.largerBuffer() method using exponential doubling, resulting in a Denial of Service (DoS) for the affected application." } ], "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-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:camel_spring_boot:4" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Apache Camel - HawtIO 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "unaffected", "cpes": [ "cpe:/a:redhat:apache_camel_hawtio:4" ] }, { "vendor": "Red Hat", "product": "Red Hat Data Grid 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_data_grid:8" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "moditect", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:10" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "pki-core:10.6/resteasy", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "pki-deps:10.6/resteasy", "defaultStatus": "unaffected", "cpes": [ "cpe:/o:redhat:enterprise_linux:8" ] }, { "vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "resteasy", "defaultStatus": "affected", "cpes": [ "cpe:/o:redhat:enterprise_linux:9" ] }, { "vendor": "Red Hat", "product": "Red Hat Fuse 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "affected", "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-core", "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-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_application_platform:8" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform 8", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core-2.3.10.Final.jar", "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-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core-2.3.10.Final.jar", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core-2.3.18.Final.jar", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack", "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html", "packageName": "undertow-core-2.3.23.SP3-redhat-00001.jar", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jbosseapxp" ] }, { "vendor": "Red Hat", "product": "Red Hat Process Automation 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:jboss_enterprise_bpms_platform:7" ] }, { "vendor": "Red Hat", "product": "Red Hat Single Sign-On 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "undertow-core", "defaultStatus": "affected", "cpes": [ "cpe:/a:redhat:red_hat_single_sign_on:7" ] } ], "references": [ { "url": "https://access.redhat.com/security/cve/CVE-2026-5680", "tags": [ "vdb-entry", "x_refsource_REDHAT" ] }, { "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455350", "name": "RHBZ#2455350", "tags": [ "issue-tracking", "x_refsource_REDHAT" ] } ], "datePublic": "2026-07-04T23:59:59.000Z", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-770", "description": "Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE" } ] } ], "x_redhatCweChain": "CWE-770: Allocation of Resources Without Limits or Throttling", "workarounds": [ { "lang": "en", "value": "To mitigate this issue, configure the PerMessageDeflateHandshake to limit the maximum decompressed buffer size. This can be achieved by setting the maxDecompressedBufferSize parameter to a reasonable value (e.g., 10 MB) in the PerMessageDeflateHandshake constructor. This action may require a restart of the affected application or service to take effect." } ], "timeline": [ { "lang": "en", "time": "2026-04-06T10:28:57.000Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-07-04T23:59:59.000Z", "value": "Made public." } ], "credits": [ { "lang": "en", "value": "Red Hat would like to thank Avishek Sarkar and Brian Laub for reporting this issue." } ], "providerMetadata": { "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-27T16:25:29.103Z" }, "x_generator": { "engine": "cvelib 1.8.0" } } } }