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10.0 Critical

CVE-2026-73299 Prompty is a markdown file format (.prompty) for LLM prompts

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.

Affected products and versions

Product Affected versions Fixed in
prompty 2.0 2.0.0-alpha.1 → < 2.0.0-beta.5 2.0.0-beta.5
prompty 0.1 earliest → < 0.1.5 0.1.5

Other CVEs of prompty

The 3 CVEs of prompty →
CVE-2026-53598 Prompty is a markdown file format (.prompty) for LLM prompts 7.5 High CVE-2026-53597 Prompty is a markdown file format (.prompty) for LLM prompts 8.7 High
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