CVE-2026-73299

criticalCVSS 10covered by 1 sourcefirst seen 2026-08-12

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.

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Exploitation outlook

Moderate exploitation risk1.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 66% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalCVE-2026-73299: Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5,…nvd · 2026-08-12

External references

NVD record for CVE-2026-73299

CVE.org record

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