Is CVE-2026-73299 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-73299?

CVE-2026-73299 has a CVSS v3 severity of CRITICAL (10).

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CVE-2026-73299

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.