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.
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History
Sat, 18 Jul 2026 03:30:00 +0000
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ssvc
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Thu, 16 Jul 2026 15:30:00 +0000
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| 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. | |
| Title | Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader | |
| Weaknesses | CWE-94 | |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-07-16T14:54:55.075Z
Updated: 2026-07-18T02:51:03.900Z
Reserved: 2026-06-09T19:39:52.404Z
Link: CVE-2026-53597
Updated: 2026-07-18T02:50:59.228Z
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