EUVD-2026-57382Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Untrusted template rendered without auth or interaction yields arbitrary code execution escaping the template sandbox into the Node.js host, so PR:N/UI:N/AC:L with scope change and full C/I/A impact.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Server-side template injection leading to remote code execution in Microsoft's @prompty/core npm package (TypeScript runtime) allows an attacker who controls a .prompty template body to execute arbitrary JavaScript in the host Node.js process. The flaw affects @prompty/core versions <= 0.1.4 and the 2.0.0-alpha.1 through 2.0.0-beta.4 pre-releases, where the Nunjucks renderer permitted unrestricted member access, letting a malicious template walk constructor/prototype chains to reach a JavaScript execution primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the application render an attacker-controlled .prompty template body through @prompty/core's TypeScript Nunjucks renderer - i.e., the app must ingest untrusted, community-supplied, cloned, or LLM-generated .prompty files rather than only first-party templates. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The signals largely align toward high real-world severity but with an important nuance about the attack surface. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An application lets users submit or import .prompty prompt files - for example a prompt-sharing gallery, a repo that clones community templates, or a pipeline that renders LLM-generated .prompty content - and passes them to @prompty/core's Nunjucks renderer. The attacker crafts a template whose body traverses constructor and prototype properties to reach the JavaScript Function constructor and execute code, gaining arbitrary command execution in the Node.js host process. … |
| Remediation | Vendor-released patch: upgrade @prompty/core to 0.1.5 (for the 0.1.x line) or 2.0.0-beta.5 (for the 2.0.0 pre-release line) or later, per GHSA-w28w-gp39-m4p6 and PR https://github.com/microsoft/prompty/pull/404. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an immediate inventory of all systems running @prompty/core versions 0.1.4 or earlier, or pre-release versions 2.0.0-alpha.1 through 2.0.0-beta.4, and identify which of these systems process .prompty templates from external, community-supplied, or programmatically-generated sources. …
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Same weakness CWE-94 – Code Injection
View allSame technique Code Injection
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External POC / Exploit Code
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