VULNERABILITY INTELLIGENCE

CVE-2026-53597

EPSS probability0.97%
CISA KEVNot currently listed
Published2026-07-16
Last modified2026-10-24

Description

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.

Weakness classification

  • security-advisories@github.com: CWE-94

Primary references