High severityNVD Advisory· Published Jul 16, 2026· Updated Jul 18, 2026
CVE-2026-53597
CVE-2026-53597
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@prompty/corenpm | >= 2.0.0-alpha.1, < 2.0.0-beta.3 | 2.0.0-beta.3 |
Affected products
1Patches
Vulnerability mechanics
References
4News mentions
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