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CVE-2026-78847 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CNA: CISA-ADPCVSS-B:9.8 CRITICALVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/jonschlinkert/gray-matter/issues/182	CISA-ADP	Issue TrackingVendor
https://blog.checo.cc/en/posts/Security/1	[email protected]	ExploitRemedyTechnical Analysis
https://github.com/jonschlinkert/gray-matter/issues/112	[email protected]	Issue TrackingTechnical DescriptionVendor
https://github.com/jonschlinkert/gray-matter/issues/131	[email protected]	Issue TrackingTechnical DescriptionVendor
https://github.com/jonschlinkert/gray-matter/issues/182	[email protected]	Issue TrackingVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-95	Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')	CISA-ADP

Affected Products

Product	Versions
gray-matter	>= 4.0.0, < 4.0.4 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: @11ty/gray-matter@2moderate effort Workaround:low effort Override the built-in JavaScript engine by setting `matter.engines.javascript = { parse: () => ({}), stringify: () => '' };` before any `matter()` calls. Mitigation:low effort Avoid parsing untrusted input by only parsing content you generate yourself or by taking the body only and not parsing front matter at all.

Product

Versions

gray-matter

>= 4.0.0, < 4.0.4 (semver)

CPE

No CPEs found in CPE dictionary for this product.

Remediation

Upgrade: @11ty/gray-matter@2moderate effort
Workaround:low effort
Override the built-in JavaScript engine by setting `matter.engines.javascript = { parse: () => ({}), stringify: () => '' };` before any `matter()` calls.
Mitigation:low effort
Avoid parsing untrusted input by only parsing content you generate yourself or by taking the body only and not parsing front matter at all.

Change History

2 change records found show changes

Date	Action	Recorded By
Sep 22, 2026	CVE Modified	CISA-ADP
Sep 21, 2026	New CVE Received	[email protected]