AUGUST 14, 2026
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Case File

CVE-2026-73299

CRITICAL · CVSS 10 EPSS 1.21% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-12 · Last synced 2026-08-14

CyberRota Analysis

AI-Generated

The vulnerability affects the TypeScript Nunjucks renderer in Prompty, allowing untrusted markdown templates to execute arbitrary JavaScript in the host Node.js process due to unrestricted access to JavaScript member properties. This critical flaw can lead to severe security breaches, including remote code execution, making it imperative for organizations using affected versions to upgrade to 0.1.5 or 2.0.0-beta.5 immediately. Developers and security teams utilizing Prompty should prioritize this update to mitigate potential exploitation risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-73299
Severity
CRITICAL
CVSS
10
EPSS
1.21%
Java

Original 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.