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CVE-2026-78847VulnerabilityPublished

gray-matter All · Eval Injection

Affects gray-matterSource GCVE Database

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Authoritative record:CVE-2026-78847· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 48% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
npmgray-matterpkg:npm/gray-matterOther threatsAffected
  • *
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until an official fix is available, avoid processing untrusted input with gray-matter when using JavaScript front matter parsing or disable the use of the JavaScript engine for front matter parsing if possible.

Description

A vulnerability in gray-matter affects all versions, including 4.0.3, where the JavaScript engine in lib/engines.js uses eval() to parse front matter when the language is set to js/javascript. This behavior allows arbitrary code execution.

References

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