---
title: "CVE-2026-78847: gray-matter - Remote Code Execution"
description: "gray-matter All versions contains a remote code execution caused by use of eval() in lib/engines.js to parse front matter with language set to js/javascript, letting attackers execute arbitrary code remotely, exploit requires crafted front matter input."
url: https://panop.io/threat-heartbeat/CVE-2026-78847/
---

# CVE-2026-78847 gray-matter - Remote Code Execution

gray-matter All versions contains a remote code execution caused by use of eval() in lib/engines.js to parse front matter with language set to js/javascript, letting attackers execute arbitrary code remotely, exploit requires crafted front matter input.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.60% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-78847)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

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

Published

21 September 2026

Updated

15 October 2026

Weakness

[CWE-95](https://cwe.mitre.org/data/definitions/95.html)

## Vendor fix

Update to the latest version of gray-matter.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-78847](https://nvd.nist.gov/vuln/detail/CVE-2026-78847)
- [https://blog.checo.cc/en/posts/Security/1](https://blog.checo.cc/en/posts/Security/1)
- [https://github.com/jonschlinkert/gray-matter/issues/112](https://github.com/jonschlinkert/gray-matter/issues/112)
- [https://github.com/jonschlinkert/gray-matter/issues/131](https://github.com/jonschlinkert/gray-matter/issues/131)
- [https://github.com/jonschlinkert/gray-matter/issues/182](https://github.com/jonschlinkert/gray-matter/issues/182)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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