CVE-2026-41081

{
  "id": "CVE-2026-41081",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-27T14:16:48.167",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Handling of TLS Client Authentication Failure Leading to Anonymous Principal Assignment in Apache Storm\n\nVersions Affected: up to 2.8.7\n\nDescription: When TLS transport is enabled in Apache Storm without requiring client certificate authentication (the default configuration), the TlsTransportPlugin assigns a fallback principal (CN=ANONYMOUS) if no client certificate is presented or if certificate verification fails. The underlying SSLPeerUnverifiedException is caught and suppressed rather than rejecting the connection.\n\nThis fail-open behavior means an unauthenticated client can establish a TLS connection and receive a valid principal identity. If the configured authorizer (e.g., SimpleACLAuthorizer) does not explicitly deny access to CN=ANONYMOUS, this may result in unauthorized access to Storm services. The condition is logged at debug level only, reducing visibility in production.\n\nImpact: Unauthenticated clients may be assigned a principal identity, potentially bypassing authorization in permissive or misconfigured environments.\n\nMitigation: Users should upgrade to 2.8.7 in which TLS authentication failures are handled in a fail-closed manner.\n\nUsers who cannot upgrade immediately should:\n- Enable mandatory client certificate authentication (nimbus.thrift.tls.client.auth.required: true)\n- Ensure authorization rules explicitly deny access to CN=ANONYMOUS\n- Review all ACL configurations for implicit default-allow behavior"
    },
    {
      "lang": "es",
      "value": "Manejo Inadecuado de Fallas en la Autenticación de Cliente TLS que Conduce a la Asignación de un Principal Anónimo en Apache Storm\n\nVersiones Afectadas: hasta la 2.8.7\n\nDescripción: Cuando el transporte TLS está habilitado en Apache Storm sin requerir autenticación de certificado de cliente (la configuración predeterminada), el TlsTransportPlugin asigna un principal de respaldo (CN=ANONYMOUS) si no se presenta ningún certificado de cliente o si la verificación del certificado falla. La SSLPeerUnverifiedException subyacente es capturada y suprimida en lugar de rechazar la conexión.\n\nEste comportamiento de ’fail-open’ significa que un cliente no autenticado puede establecer una conexión TLS y recibir una identidad principal válida. Si el autorizador configurado (por ejemplo, SimpleACLAuthorizer) no deniega explícitamente el acceso a CN=ANONYMOUS, esto puede resultar en acceso no autorizado a los servicios de Storm. La condición se registra solo a nivel de depuración, reduciendo la visibilidad en producción.\n\nImpacto: A los clientes no autenticados se les puede asignar una identidad principal, eludiendo potencialmente la autorización en entornos permisivos o mal configurados.\n\nMitigación: Los usuarios deben actualizar a la versión 2.8.7 en la que las fallas de autenticación TLS se manejan de manera ’fail-closed’.\n\nLos usuarios que no puedan actualizar inmediatamente deben:\n- Habilitar la autenticación obligatoria de certificado de cliente (nimbus.thrift.tls.client.auth.required: true)\n- Asegurar que las reglas de autorización denieguen explícitamente el acceso a CN=ANONYMOUS\n- Revisar todas las configuraciones de ACL para detectar comportamientos implícitos de ’permitir por defecto’"
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Storm Client",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.maven.apache.org/maven2/",
          "packageName": "org.apache.storm:storm-client",
          "versions": [
            {
              "version": "0",
              "lessThan": "2.8.7",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-27T14:42:46.312578Z",
          "id": "CVE-2026-41081",
          "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-287"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:apache:storm:*:*:*:*:*:*:*:*",
              "versionEndExcluding": "2.8.7",
              "matchCriteriaId": "9286B022-3864-4ED1-B740-F1BD9B79820F"
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  ],
  "references": [
    {
      "url": "https://lists.apache.org/thread/plxx5l29dvplk5rwzdcq53rdfl6v4gs8",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/04/25/3",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    }
  ]
}