CVE-2026-73299

{
  "id": "CVE-2026-73299",
  "sourceIdentifier": "[email protected]",
  "published": "2026-08-12T18:18:15.197",
  "lastModified": "2026-10-24T15:10:00.190",
  "vulnStatus": "Deferred",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5."
    },
    {
      "lang": "es",
      "value": "Prompty es un formato de archivo markdown (.prompty) para prompts de LLM. Antes de las versiones 0.1.5 y 2.0.0-beta.5, el renderizador TypeScript Nunjucks evaluaba cuerpos de plantillas .prompty no confiables con acceso irrestricto a miembros de JavaScript. Una plantilla controlada por el atacante podría recorrer propiedades de constructor y prototipo para ejecutar JavaScript en el proceso host de Node.js. Este problema está solucionado en las versiones 0.1.5 y 2.0.0-beta.5."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "microsoft",
          "product": "prompty",
          "versions": [
            {
              "version": "< 0.1.5",
              "status": "affected"
            },
            {
              "version": ">= 2.0.0-alpha.1, < 2.0.0-beta.5",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 10.0,
          "baseSeverity": "CRITICAL",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-08-12T18:53:50.277151Z",
          "id": "CVE-2026-73299",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-94"
        },
        {
          "lang": "en",
          "value": "CWE-1336"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/prompty/pull/404",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/prompty/pull/405",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6",
      "source": "[email protected]"
    },
    {
      "url": "https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5",
      "source": "[email protected]"
    }
  ]
}