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CVE-2026-25793

Estado: AnalizadaAlta (7.6)—

Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3.

CVSS

Probabilidad de explotación (EPSS)

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.

Vulnerabilidad de red (AV:N, PR:L) en servicio remoto; ECDSA Signature Malleability permite evadir mecanismos de autenticación/certificados, afectando validación de firmas digitales.

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

Privileged Account ManagementVulnerability ScanningThreat Intelligence ProgramRestrict Registry PermissionsNetwork SegmentationDisable or Remove Feature or Program

Tecnologías afectadas (1)

Slack — Nebula

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2026-25793",
  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
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            },
            {
              "automatable": "no"
            },
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              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-02-09T15:19:12.820151Z"
        }
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
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        "type": "Secondary",
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          "version": "4.0",
          "Recovery": "NOT_DEFINED",
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          "modifiedAttackRequirements": "NOT_DEFINED",
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          "vulnerabilityResponseEffort": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED"
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          "versions": [
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              "version": ">= 1.7.0, < 1.10.3"
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  "published": "2026-02-06T23:15:54.830",
  "references": [
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      "url": "https://github.com/slackhq/nebula/commit/f573e8a26695278f9d71587390fbfe0d0933aa21",
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      "tags": [
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      "source": "security-advisories@github.com"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
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          "value": "CWE-347"
        }
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  ],
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      "value": "Nebula is a scalable overlay networking tool. In versions from 1.7.0 to 1.10.2, when using P256 certificates (which is not the default configuration), it is possible to evade a blocklist entry created against the fingerprint of a certificate by using ECDSA Signature Malleability to use a copy of the certificate with a different fingerprint. This issue has been patched in version 1.10.3."
    },
    {
      "lang": "es",
      "value": "Nebula es una herramienta de red superpuesta escalable. En las versiones de 1.7.0 a 1.10.2, al usar certificados P256 (lo cual no es la configuración predeterminada), es posible evadir una entrada en la lista de bloqueo creada contra la huella digital de un certificado al usar la Maleabilidad de la Firma ECDSA para usar una copia del certificado con una huella digital diferente. Este problema ha sido parcheado en la versión 1.10.3."
    }
  ],
  "lastModified": "2026-06-17T10:25:15.267",
  "configurations": [
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              "matchCriteriaId": "95C8E184-A4E9-4558-8824-D89590D62C4C",
              "versionEndExcluding": "1.10.3",
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}