CVE-2026-31837

Estado: ModificadaAlta (8.7)—
Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a user of Istio is impacted if the JWKS resolver becomes unavailable or the fetch fails, exposing hardcoded defaults regardless of use of the RequestAuthentication resource. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8.
CVSS

Versión: 4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Puntuación base: 8.7
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.68%
Percentil entre todas las CVEs puntuadas: 51
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 access75 %
Impacto principalT1005 Data from Local Systemcollection80 %
Acceso de red sin autenticación (AV:N/PR:N/UI:N) expone datos sensibles (VC:H) por fallo en validación JWKS; CWE-200 (exposición de información) confirma lectura de datos.
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

Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Filter Network Traffic Application Isolation and Sandboxing
Tecnologías afectadas (1)

Istio — Istio
CWE

CWE-200
CWE-1392
Referencias

JSON original (NVD)

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          "packageName": "rhoai/odh-notebook-controller-rhel8",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "defaultStatus": "unaffected"
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      ]
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  ],
  "published": "2026-03-10T22:16:21.720",
  "references": [
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      "url": "https://github.com/istio/istio/security/advisories/GHSA-v75c-crr9-733c",
      "tags": [
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      "url": "https://access.redhat.com/errata/RHSA-2026:10184",
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
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      "source": "security-advisories@github.com",
      "description": [
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          "lang": "en",
          "value": "CWE-200"
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      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "description": [
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          "lang": "en",
          "value": "CWE-1392"
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      "lang": "en",
      "value": "Istio is an open platform to connect, manage, and secure microservices. Prior to 1.29.1, 1.28.5, and 1.27.8, a user of Istio is impacted if the JWKS resolver becomes unavailable or the fetch fails, exposing hardcoded defaults regardless of use of the RequestAuthentication resource. This vulnerability is fixed in 1.29.1, 1.28.5, and 1.27.8."
    },
    {
      "lang": "es",
      "value": "Istio es una plataforma abierta para conectar, gestionar y proteger microservicios. Antes de 1.29.1, 1.28.5 y 1.27.8, un usuario de Istio se ve afectado si el resolvedor JWKS deja de estar disponible o la obtención falla, exponiendo valores predeterminados codificados independientemente del uso del recurso RequestAuthentication. Esta vulnerabilidad está corregida en 1.29.1, 1.28.5 y 1.27.8."
    }
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  "lastModified": "2026-07-20T12:18:28.157",
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