CVE-2026-81624
Full vulnerability record from the local CVENow database.
Description
Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
Published
2026-08-31 09:17:03.453000
Last modified
2026-11-05 00:17:30.240000
View original CVE JSON
{
"id": "CVE-2026-81624",
"sourceIdentifier": "[email protected]",
"published": "2026-08-31T09:17:03.453",
"lastModified": "2026-11-05T00:17:30.240",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Undertow is a flexible performant web server used in JBoss EAP and WildFly. A flaw was found in how Undertow handles WebSocket connections. Specifically, certain configuration limits like message buffer sizes and session timeouts cannot be adjusted and default to being unlimited. This allows a remote attacker to send large amounts of data or maintain connections indefinitely, potentially crashing the server by exhausting its memory or other resources."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Red Hat",
"product": "Red Hat build of Apache Camel for Spring Boot 4",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "undertow-core",
"cpes": [
"cpe:/a:redhat:camel_spring_boot:4"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 10",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "moditect",
"cpes": [
"cpe:/a:redhat:enterprise_linux:10"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "pki-core:10.6/resteasy",
"cpes": [
"cpe:/a:redhat:enterprise_linux:8"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Enterprise Linux 8",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "pki-deps:10.6/resteasy",
"cpes": [
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]
},
{
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"packageName": "resteasy",
"cpes": [
"cpe:/a:redhat:enterprise_linux:9"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Fuse 7",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "undertow-core",
"cpes": [
"cpe:/a:redhat:jboss_fuse:7"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8",
"cpes": [
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]
},
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8",
"cpes": [
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]
},
{
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"packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8",
"cpes": [
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]
},
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "undertow-core",
"cpes": [
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]
},
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "undertow-core",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"defaultStatus": "unaffected",
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"packageName": "undertow-core",
"cpes": [
"cpe:/a:redhat:jbosseapxp"
]
},
{
"vendor": "Red Hat",
"product": "Red Hat Single Sign-On 7",
"defaultStatus": "affected",
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"packageName": "undertow-core",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "[email protected]",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"timestamp": "2026-09-01T15:07:47.111478Z",
"id": "CVE-2026-81624",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
]
},
"weaknesses": [
{
"source": "[email protected]",
"type": "Secondary",
"description": [
{
"lang": "en",
"value": "CWE-770"
}
]
}
],
"references": [
{
"url": "https://access.redhat.com/security/cve/CVE-2026-81624",
"source": "[email protected]"
},
{
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524868",
"source": "[email protected]"
}
]
}