FKIE_CVE-2026-15561
Vulnerability from fkie_nvd - Published: 2026-08-11 09:17 - Updated: 2026-08-12 16:16
Severity
Summary
A flaw was found in EAP's undertow http/1.1 chunked-transfer decoder. missing limits on size and count would allow an attacker to use an unauthenticated connection to drive the JVM to an OutOfMemory error, stopping all deployments on the listener, and achieving Denial of Service.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7.4::el7"
],
"defaultStatus": "unaffected",
"packageName": "undertow-core",
"product": "Red Hat JBoss Enterprise Application Platform 7.4.25",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-activemq-artemis",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.16.0-22.redhat_00057.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-glassfish-jsf",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.3.14-11.SP11_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-ironjacamar",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.5.26-2.Final_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jackson-annotations",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.18.8-1.redhat_00003.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jackson-core",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.18.8-1.redhat_00003.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jackson-databind",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.18.8-1.redhat_00003.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jackson-jaxrs-providers",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.18.8-1.redhat_00003.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jackson-modules-base",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.18.8-1.redhat_00003.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jackson-modules-java8",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.18.8-1.redhat_00003.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jboss-remoting",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:5.0.31-3.SP2_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-jboss-server-migration",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.10.0-46.Final_redhat_00044.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-netty",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:4.1.135-1.Final_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-netty-transport-native-epoll",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:4.1.135-1.Final_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-picketlink-bindings",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.5.5-30.SP12_redhat_00020.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-picketlink-federation",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.5.5-24.SP12_redhat_00016.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-undertow",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:2.2.40-2.SP3_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform_els:7.4::el7"
],
"defaultStatus": "affected",
"packageName": "eap7-wildfly",
"product": "Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:7.4.25-2.GA_redhat_00001.1.el7eap",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:8"
],
"defaultStatus": "affected",
"packageName": "undertow-core",
"product": "Red Hat JBoss Enterprise Application Platform 8",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jbosseapxp"
],
"defaultStatus": "unaffected",
"packageName": "undertow-core",
"product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
"vendor": "Red Hat"
}
],
"source": "secalert@redhat.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A flaw was found in EAP\u0027s undertow http/1.1 chunked-transfer decoder. missing limits on size and count would allow an attacker to use an unauthenticated connection to drive the JVM to an OutOfMemory error, stopping all deployments on the listener, and achieving Denial of Service."
}
],
"id": "CVE-2026-15561",
"lastModified": "2026-08-12T16:16:53.970",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"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"
},
"exploitabilityScore": 3.9,
"impactScore": 3.6,
"source": "secalert@redhat.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-15561",
"options": [
{
"exploitation": "none"
},
{
"automatable": "yes"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-11T16:09:41.801549Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-08-11T09:17:12.963",
"references": [
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/errata/RHSA-2026:53644"
},
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/errata/RHSA-2026:53806"
},
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/security/cve/CVE-2026-15561"
},
{
"source": "secalert@redhat.com",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2483133"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "secalert@redhat.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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