CVE-2026-81624

Estado: Pendiente de análisisAlta (7.5)—

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.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.58%
Percentil entre todas las CVEs puntuadas: 46
Fecha de la puntuación: 6/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access85 %
Impacto principalT1499.004 Application or System Exploitationimpact90 %

AV:N/PR:N/UI:N indica explotación remota sin privilegios (T1190). CWE-770 con límites de buffer ilimitados permite DoS por agotamiento de recursos (T1499.004).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (3)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Redhat — Jboss EAP^AI Redhat — Undertow^AI Redhat — Wildfly^AI

CWE

CWE-770

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-81624",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-81624",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-01T15:07:47.111478Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "secalert@redhat.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "secalert@redhat.com",
      "affectedData": [
        {
          "cpes": [
            "cpe:/a:redhat:camel_spring_boot:4"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat build of Apache Camel for Spring Boot 4",
          "packageName": "undertow-core",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 10",
          "packageName": "moditect",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 8",
          "packageName": "pki-core:10.6/resteasy",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 8",
          "packageName": "pki-deps:10.6/resteasy",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
        },
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Enterprise Linux 9",
          "packageName": "resteasy",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_fuse:7"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Fuse 7",
          "packageName": "undertow-core",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:7"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat JBoss Enterprise Application Platform 7",
          "packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8",
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:7"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat JBoss Enterprise Application Platform 7",
          "packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8",
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:7"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat JBoss Enterprise Application Platform 7",
          "packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8",
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:7"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat JBoss Enterprise Application Platform 7",
          "packageName": "undertow-core",
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jboss_enterprise_application_platform:8"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat JBoss Enterprise Application Platform 8",
          "packageName": "undertow-core",
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "defaultStatus": "affected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:jbosseapxp"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
          "packageName": "undertow-core",
          "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
          "defaultStatus": "unaffected"
        },
        {
          "cpes": [
            "cpe:/a:redhat:red_hat_single_sign_on:7"
          ],
          "vendor": "Red Hat",
          "product": "Red Hat Single Sign-On 7",
          "packageName": "undertow-core",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-08-31T09:17:03.453",
  "references": [
    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-81624",
      "source": "secalert@redhat.com"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2524868",
      "source": "secalert@redhat.com"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ]
    }
  ],
  "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."
    }
  ],
  "lastModified": "2026-09-10T08:16:59.283",
  "sourceIdentifier": "secalert@redhat.com"
}