CVE-2026-40557

{
  "id": "CVE-2026-40557",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-27T14:16:48.017",
  "lastModified": "2026-10-26T22:10:00.163",
  "vulnStatus": "Analyzed",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Improper Certificate Validation via Global SSL Context Downgrade in Apache Storm Prometheus Reporter\n\n\nVersions Affected: from 2.6.3 to 2.8.6\n\n\nDescription: \n\nIn production deployments where an administrator enables storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation (by default it is disabled) intending to affect only the Prometheus reporter, the undocumented global side effect creates an attack surface across every TLS-protected communication channel in the Storm daemon.\n\n\nThe PrometheusPreparableReporter class implements an INSECURE_TRUST_MANAGER that accepts all SSL certificates without validation, with empty checkClientTrusted and checkServerTrusted methods. Most critically, when the storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation configuration option is enabled (default = disabled) for HTTPS Prometheus PushGateway connections, the INSECURE_CONNECTION_FACTORY calls SSLContext.setDefault(sslContext), which globally replaces the JVM's default SSL context rather than applying the insecure context only to the Prometheus connection. This payload flows through storm.yaml configuration → PrometheusPreparableReporter.prepare() → INSECURE_CONNECTION_FACTORY → SSLContext.setDefault(), resulting in a JVM-wide TLS security downgrade. All subsequent HTTPS connections in the process - including ZooKeeper, Thrift, Netty, and UI connections - silently trust all certificates, including self-signed, expired, and attacker-generated ones, enabling man-in-the-middle interception of cluster state, topology submissions, tuple data, and administrative credentials.\n\n\n\n\nMitigation: 2.x users should upgrade to 2.8.7 if the Prometheus Metrics Reporter is used. Prometheus Metrics Reporter Users who cannot upgrade immediately should remove the storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation: true setting from their storm.yaml configuration and instead configure a proper truststore containing the PushGateway's certificate."
    },
    {
      "lang": "es",
      "value": "Validación de Certificados Inapropiada a través de Degradación Global del Contexto SSL en el Reportero Prometheus de Apache Storm\n\nVersiones Afectadas: de 2.6.3 a 2.8.6\n\nDescripción:\n\nEn despliegues de producción donde un administrador habilita storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation (por defecto está deshabilitado) con la intención de afectar solo al reportero Prometheus, el efecto secundario global no documentado crea una superficie de ataque a través de cada canal de comunicación protegido por TLS en el demonio Storm.\n\nLa clase PrometheusPreparableReporter implementa un INSECURE_TRUST_MANAGER que acepta todos los certificados SSL sin validación, con métodos checkClientTrusted y checkServerTrusted vacíos. Lo más crítico, cuando la opción de configuración storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation está habilitada (por defecto = deshabilitado) para conexiones HTTPS de Prometheus PushGateway, el INSECURE_CONNECTION_FACTORY llama a SSLContext.setDefault(sslContext), lo que reemplaza globalmente el contexto SSL por defecto de la JVM en lugar de aplicar el contexto inseguro solo a la conexión de Prometheus. Esta carga útil fluye a través de la configuración de storm.yaml ? PrometheusPreparableReporter.prepare() ? INSECURE_CONNECTION_FACTORY ? SSLContext.setDefault(), resultando en una degradación de seguridad TLS a nivel de JVM. Todas las conexiones HTTPS subsiguientes en el proceso - incluyendo conexiones de ZooKeeper, Thrift, Netty y UI - confían silenciosamente en todos los certificados, incluyendo los autofirmados, caducados y generados por atacantes, habilitando la intercepción man-in-the-middle del estado del clúster, envíos de topologías, datos de tuplas y credenciales administrativas.\n\nMitigación: Los usuarios de 2.x deberían actualizar a 2.8.7 si se utiliza el Reportero de Métricas de Prometheus. Los usuarios del Reportero de Métricas de Prometheus que no puedan actualizar inmediatamente deberían eliminar la configuración storm.daemon.metrics.reporter.plugin.prometheus.skip_tls_validation: true de su configuración storm.yaml y en su lugar configurar un almacén de confianza (truststore) adecuado que contenga el certificado del PushGateway."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Apache Software Foundation",
          "product": "Apache Storm Prometheus Reporter",
          "defaultStatus": "unaffected",
          "collectionURL": "https://repo.maven.apache.org/maven2/",
          "packageName": "org.apache.storm:storm-metrics-prometheus",
          "versions": [
            {
              "version": "2.6.3",
              "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:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
          "baseScore": 4.8,
          "baseSeverity": "MEDIUM",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 2.5
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-27T13:58:23.511144Z",
          "id": "CVE-2026-40557",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:apache:storm_prometheus_reporter:*:*:*:*:*:*:*:*",
              "versionStartIncluding": "2.6.3",
              "versionEndExcluding": "2.8.7",
              "matchCriteriaId": "3BAEE5C8-86FE-4927-BB10-A14FFF4BFD75"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://lists.apache.org/thread/f5bv68z1y5xstz22psjk05p3wn86knjq",
      "source": "[email protected]",
      "tags": [
        "Mailing List",
        "Vendor Advisory"
      ]
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/04/25/2",
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ]
    }
  ]
}