CVEvulnerability
CVE-2026-73299
10.0 CRITICAL
Official page ↗
- Status
- Deferred
- Published
- 2026-08-12
- Last modified
- 2026-10-24
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 10.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weaknesses
- CWE-1336, CWE-94
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.
Related
References
- https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e github.com
- https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f github.com
- https://github.com/microsoft/prompty/pull/404 github.com
- https://github.com/microsoft/prompty/pull/405 github.com
- https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6 github.com
- https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5 github.com