CVE-2026-73299

CriticalCVSS 10.0/10Last modified Oct 24, 2026

Description

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.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-94CWE-1336

Affected software

No affected versions have been published.

Timeline

Published
Aug 12, 2026
Last modified
Oct 24, 2026
NVD status
Deferred

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CVE-2026-73299: Critical severity, CVSS 10.0 | Vulnix