CVE-2026-73299
Critical
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.
SeverityCritical
CVSS10.0
Exploit probability—
Product@prompty/core
PublishedAug 12, 2026
First seenAug 12, 2026
Weakness typeCWE-94Code injectionCWE-1336CWE-1336
How to fix
Update
- @prompty/core0.1.5, 2.0.0-beta.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @prompty/corenpm | v < 0.1.5, 2.0.0-alpha.1 ≤ v < 2.0.0-beta.5 | 0.1.5, 2.0.0-beta.5 |
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