CVE-2026-53597
CVE-2026-53597 · Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader
This page contains facts from public vulnerability sources. Check the original advisory before updating.
Prompty is a markdown file format (.prompty) for LLM prompts. From 2.0.0-alpha.1 until 2.0.0-beta.3, the @prompty/core TypeScript loader in runtime/typescript/packages/core/src/core/loader.ts used gray-matter without overriding executable js and javascript frontmatter engines, allowing an attacker-controlled .prompty file with ---js frontmatter to execute arbitrary JavaScript during prompt loading. This issue is fixed in version 2.0.0-beta.3.
CVSS 8.7 · High · EPSS 1.0% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
prompty
- Versions
- >= 2.0.0-alpha.1, < 2.0.0-beta.3: Affected
No fix published
@prompty/core npm
- Affected ranges
- SEMVER: ≥ 2.0.0-alpha.1, < 2.0.0-beta.3
Update to 2.0.0-beta.3