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Vulnerability record · CVE-2026-73299 · published 12 August 2026

CVE-2026-73299: Code injection vulnerability

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.

10.0 CVSS 3.1 Critical EPSS 1.8% · top 22.6% CWE-94 · Code injectionCWE-1336 · CWE-1336 Deferred
10.0CVSS 3.1 base score
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
9 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e
https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f
https://github.com/microsoft/prompty/pull/404
https://github.com/microsoft/prompty/pull/405
https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6
https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5

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Source: NIST National Vulnerability Database (record CVE-2026-73299), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.