{"id":"CVE-2026-73299","sourceIdentifier":"security-advisories@github.com","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":"security-advisories@github.com","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":"security-advisories@github.com","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":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-94"},{"lang":"en","value":"CWE-1336"}]}],"references":[{"url":"https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e","source":"security-advisories@github.com"},{"url":"https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f","source":"security-advisories@github.com"},{"url":"https://github.com/microsoft/prompty/pull/404","source":"security-advisories@github.com"},{"url":"https://github.com/microsoft/prompty/pull/405","source":"security-advisories@github.com"},{"url":"https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6","source":"security-advisories@github.com"},{"url":"https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5","source":"security-advisories@github.com"}]}