Arbitrary Code Injection Affecting gray-matter package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Arbitrary Code Injection vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-JS-GRAYMATTER-20532010
- published6 Oct 2026
- disclosed21 Sept 2026
- creditUnknown
Introduced: 21 Sep 2026
NewCVE-2026-78847 (opens in a new tab)How to fix?
There is no fixed version for gray-matter.
Overview
gray-matter is a Parse front-matter from a string or file. Fast, reliable and easy to use. Parses YAML front matter by default, but also has support for YAML, JSON, TOML or Coffee Front-Matter, with options to set custom delimiters. Used by metalsmith, assemble, verb and
Affected versions of this package are vulnerable to Arbitrary Code Injection via the eval process in lib/engines.js when parsing front matter with the language set to js or javascript. An attacker can execute arbitrary code by supplying crafted input that is evaluated by the JavaScript engine.