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CVE-2026-95831

Estado: AplazadaAlta (7.8)—

Crypt::SelfCertificate versions from 1.01 through 1.05 for Perl contains malware which executes Python code from an obfuscated URL.

The generate_certificate runs a Python script saved as a certificate file. The pyhton script attempts to retrieve code from a hardcoded http URL that is obfuscated with base64 encoding and run the response body directly.

The impact is that arbitrary code can be invoked as the user, without a dropped script being saved on the affected host.

The releases have no test scripts nor build hooks. The intention may have been to trigger the payload after installation.

For version 1.01, the dropper script is in lib/Crypt/SelfCertificate/sample/validate.p12.

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For version 1.05, the dropper script is in lib/Crypt/SelfCertificate/sample/cert7.pem.

The SHA-256 digests of the files are

Detalles técnicos trazas, registros y código del informe original
    fbff21f45ff748365062a5e36fb2d72558cad82a507a6f357f320b4fcdf07760 Crypt-SelfCertificate-1.01.tar.gz
    27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/validate.p12

    9fdfa7d69b034b77d4510cda567e8da1e486ca81c7daaadc5732a45c41d71991 Crypt-SelfCertificate-1.05.tar.gz
    27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/cert7.pem

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.

Malware incrustado en paquete Perl ejecuta código Python desde URL ofuscada tras instalación. Vector AV:L/UI:R sugiere interacción local, pero el impacto principal es ejecución remota de código arbitrario sin fichero persistente.

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

Restrict Web-Based ContentNetwork Intrusion PreventionFilter Network TrafficExecution PreventionBehavior Prevention on EndpointDisable or Remove Feature or Program

Tecnologías afectadas (1)

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

Crypt Selfcertificate — Crypt SelfcertificateAI

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-95831",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-95831",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-22T20:13:35.298576Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "modules": [
            "Crypt::SelfCertificate"
          ],
          "versions": [
            {
              "status": "affected",
              "version": "1.01",
              "versionType": "custom",
              "lessThanOrEqual": "1.05"
            }
          ],
          "packageURL": "pkg:cpan/Crypt-SelfCertificate",
          "packageName": "Crypt-SelfCertificate",
          "programFiles": [
            "lib/Crypt/SelfCertificate.pm",
            "lib/Crypt/SelfCertificate/sample/validate.p12",
            "lib/Crypt/SelfCertificate/sample/cert7.pem"
          ],
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2026-09-22T19:17:00.227",
  "references": [
    {
      "url": "https://www.nntp.perl.org/group/perl.cpan.testers.discuss/2026/09/msg4754.html",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/09/22/21",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/09/23/2",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "http://www.openwall.com/lists/oss-security/2026/09/23/3",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "description": [
        {
          "lang": "en",
          "value": "CWE-506"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Crypt::SelfCertificate versions from 1.01 through 1.05 for Perl contains malware which executes Python code from an obfuscated URL.\n\nThe generate_certificate runs a Python script saved as a certificate file.  The pyhton script attempts to retrieve code from a hardcoded http URL that is obfuscated with base64 encoding and run the response body directly.\n\nThe impact is that arbitrary code can be invoked as the user, without a dropped script being saved on the affected host.\n\nThe releases have no test scripts nor build hooks.  The intention may have been to trigger the payload after installation.\n\nFor version 1.01, the dropper script is in lib/Crypt/SelfCertificate/sample/validate.p12.\n\nFor version 1.05, the dropper script is in lib/Crypt/SelfCertificate/sample/cert7.pem.\n\nThe SHA-256 digests of the files are\n\n    fbff21f45ff748365062a5e36fb2d72558cad82a507a6f357f320b4fcdf07760 Crypt-SelfCertificate-1.01.tar.gz\n    27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/validate.p12\n\n    9fdfa7d69b034b77d4510cda567e8da1e486ca81c7daaadc5732a45c41d71991 Crypt-SelfCertificate-1.05.tar.gz\n    27b2d2d3174ad771474fff2521f5084ec231e9218ea8c832515aef1cbd5897bc lib/Crypt/SelfCertificate/sample/cert7.pem"
    }
  ],
  "lastModified": "2026-09-23T17:17:20.773",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
}