What is CVE-2026-78847?

CVE-2026-78847 is a critical-severity vulnerability in N/a, classified under Eval Injection. CVSS score: 9.8/10. Published 2026-09-21.

How severe is CVE-2026-78847?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in N/a

CVE-2026-78847

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.

Published 2026-09-21 · last modified 2026-09-22.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (48.5th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Weakness classification (CWE)

CWE-95 — Eval Injection

References

Frequently asked questions

What is CVE-2026-78847?: CVE-2026-78847 is a critical-severity vulnerability in N/a, classified under Eval Injection. CVSS score: 9.8/10. Published 2026-09-21.
How severe is CVE-2026-78847?: Critical severity. CVSS v3 base score is 9.8 out of 10.