CVE-2026-78847

Arbitrary code execution via eval() in front matter parsing

Published Sep 21, 2026 CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed
Description
An issue in gray-matter All versions (verified on 4.0.3) allows the JavaScript engine in lib/engines.js using eval() to parse front matter when language is js/javascript.This allows arbitrary code execution.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Arbitrary code execution via eval() in front matter parsing
Type Values Removed Values Added
Title gray-matter JavaScript Front Matter Evaluates User Input, Enabling Arbitrary Code Execution
Weaknesses CWE-94
Type Values Removed Values Added
Weaknesses CWE-95
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

Type Values Removed Values Added
Title gray-matter JavaScript Front Matter Evaluates User Input, Enabling Arbitrary Code Execution
Weaknesses CWE-94
Type Values Removed Values Added
Description An issue in gray-matter All versions (verified on 4.0.3) allows the JavaScript engine in lib/engines.js using eval() to parse front matter when language is js/javascript.This allows arbitrary code execution.
References

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Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 22, 2026, 3:12 PM
Reserved
Aug 25, 2026, 12:00 AM
Status
Deferred
Published
Sep 21, 2026, 10:16 PM
Modified
Sep 22, 2026, 8:00 PM