CVE-2026-78847

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-22. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 9.8Exploit: Elevated riskExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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.

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
75
EG Risk 75/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 21, 2026

Last Modified

September 22, 2026

Advisory Details (4)

Auto-updated Sep 29, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Remove RCE-vulnerable JavaScript engine (CWE-94) by MorielHarush · Pull Request #182 · jonschlinkert/gray-matter · GitHub

https://github.com/jonschlinkert/gray-matter/issues/182
generic

Security consideration: disable JS engine by default to prevent RCEs in dependents · Issue #131 · jonschlinkert/gray-matter · GitHub

https://github.com/jonschlinkert/gray-matter/issues/131
generic

Use of eval is strongly discouraged · Issue #112 · jonschlinkert/gray-matter · GitHub

https://github.com/jonschlinkert/gray-matter/issues/112
generic

An eval() engine enabled by default: code execution in gray-matter front matter (CVE-2026-78847) | Checo's Blog

https://blog.checo.cc/en/posts/Security/1

Vendor Advisories for CVE-2026-78847(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 54× in last 7d / 101× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-10-04 14:23 UTCGHSA enrichment
  2. 2026-10-04 10:07 UTCGHSA enrichment
  3. 2026-10-04 06:04 UTCGHSA enrichment
  4. 2026-10-04 02:02 UTCGHSA enrichment
  5. 2026-10-03 22:00 UTCGHSA enrichment
  6. 2026-10-03 17:58 UTCEG score recompute
  7. 2026-10-03 17:57 UTCGHSA enrichment
  8. 2026-10-03 14:26 UTCEPSS rescore
  9. 2026-10-03 13:51 UTCGHSA enrichment
  10. 2026-10-03 09:41 UTCGHSA enrichment
  11. 2026-10-03 05:34 UTCGHSA enrichment
  12. 2026-10-03 01:31 UTCGHSA enrichment
  13. 2026-10-02 21:29 UTCEG score recompute
  14. 2026-10-02 21:29 UTCGHSA enrichment
  15. 2026-10-02 17:27 UTCGHSA enrichment
  16. 2026-10-02 13:19 UTCGHSA enrichment
  17. 2026-10-02 09:16 UTCGHSA enrichment
  18. 2026-10-02 05:14 UTCGHSA enrichment
  19. 2026-10-02 01:08 UTCGHSA enrichment
  20. 2026-10-01 21:06 UTCEG score recompute
  21. 2026-10-01 21:06 UTCGHSA enrichment
  22. 2026-10-01 19:50 UTCEPSS rescore
  23. 2026-10-01 17:03 UTCGHSA enrichment
  24. 2026-10-01 13:01 UTCGHSA enrichment
  25. 2026-10-01 08:59 UTCGHSA enrichment
Show 75 more
  1. 2026-10-01 04:57 UTCGHSA enrichment
  2. 2026-10-01 00:53 UTCGHSA enrichment
  3. 2026-09-30 20:51 UTCGHSA enrichment
  4. 2026-09-30 16:49 UTCEG score recompute
  5. 2026-09-30 16:49 UTCGHSA enrichment
  6. 2026-09-30 12:46 UTCGHSA enrichment
  7. 2026-09-30 08:43 UTCGHSA enrichment
  8. 2026-09-30 04:41 UTCGHSA enrichment
  9. 2026-09-30 00:21 UTCGHSA enrichment
  10. 2026-09-29 19:55 UTCGHSA enrichment
  11. 2026-09-29 15:50 UTCEG score recompute
  12. 2026-09-29 15:50 UTCGHSA enrichment
  13. 2026-09-29 15:24 UTCEPSS rescore
  14. 2026-09-29 11:46 UTCGHSA enrichment
  15. 2026-09-29 07:44 UTCGHSA enrichment
  16. 2026-09-29 03:42 UTCGHSA enrichment
  17. 2026-09-28 23:39 UTCEG score recompute
  18. 2026-09-28 23:39 UTCGHSA enrichment
  19. 2026-09-28 19:37 UTCGHSA enrichment
  20. 2026-09-28 15:14 UTCEG score recompute
  21. 2026-09-28 15:14 UTCGHSA enrichment
  22. 2026-09-28 13:52 UTCEPSS rescore
  23. 2026-09-28 11:11 UTCGHSA enrichment
  24. 2026-09-28 07:09 UTCGHSA enrichment
  25. 2026-09-28 03:07 UTCGHSA enrichment
  26. 2026-09-27 23:05 UTCGHSA enrichment
  27. 2026-09-27 19:03 UTCGHSA enrichment
  28. 2026-09-27 15:00 UTCEG score recompute
  29. 2026-09-27 15:00 UTCGHSA enrichment
  30. 2026-09-27 13:48 UTCEPSS rescore
  31. 2026-09-27 10:57 UTCGHSA enrichment
  32. 2026-09-27 06:56 UTCGHSA enrichment
  33. 2026-09-27 02:54 UTCGHSA enrichment
  34. 2026-09-26 22:51 UTCGHSA enrichment
  35. 2026-09-26 18:49 UTCEG score recompute
  36. 2026-09-26 18:49 UTCGHSA enrichment
  37. 2026-09-26 15:59 UTCEPSS rescore
  38. 2026-09-26 14:46 UTCGHSA enrichment
  39. 2026-09-26 10:43 UTCGHSA enrichment
  40. 2026-09-26 06:39 UTCGHSA enrichment
  41. 2026-09-26 02:37 UTCEG score recompute
  42. 2026-09-26 02:37 UTCGHSA enrichment
  43. 2026-09-26 00:28 UTCEPSS rescore
  44. 2026-09-25 22:27 UTCGHSA enrichment
  45. 2026-09-25 18:20 UTCGHSA enrichment
  46. 2026-09-25 13:39 UTCGHSA enrichment
  47. 2026-09-25 09:36 UTCGHSA enrichment
  48. 2026-09-25 05:34 UTCGHSA enrichment
  49. 2026-09-25 01:32 UTCGHSA enrichment
  50. 2026-09-24 21:29 UTCGHSA enrichment
  51. 2026-09-24 16:39 UTCEG score recompute
  52. 2026-09-24 16:39 UTCGHSA enrichment
  53. 2026-09-24 14:04 UTCEPSS rescore
  54. 2026-09-24 12:34 UTCGHSA enrichment
  55. 2026-09-24 08:31 UTCGHSA enrichment
  56. 2026-09-24 04:29 UTCGHSA enrichment
  57. 2026-09-24 00:26 UTCGHSA enrichment
  58. 2026-09-23 20:24 UTCEG score recompute
  59. 2026-09-23 20:24 UTCGHSA enrichment
  60. 2026-09-23 17:54 UTCEPSS rescore
  61. 2026-09-23 16:22 UTCGHSA enrichment
  62. 2026-09-23 12:20 UTCGHSA enrichment
  63. 2026-09-23 08:18 UTCGHSA enrichment
  64. 2026-09-23 04:16 UTCGHSA enrichment
  65. 2026-09-23 00:14 UTCGHSA enrichment
  66. 2026-09-22 20:12 UTCEG score recompute
  67. 2026-09-22 20:12 UTCGHSA enrichment
  68. 2026-09-22 16:22 UTCEG score recompute
  69. 2026-09-22 16:22 UTCGHSA enrichment
  70. 2026-09-22 16:01 UTCEPSS rescore
  71. 2026-09-22 15:20 UTCEG score recompute▲ 9.80
  72. 2026-09-22 15:20 UTCGHSA enrichment
  73. 2026-09-22 15:19 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  74. 2026-09-21 22:26 UTCNVD update
  75. 2026-09-21 21:37 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-78847?
CVE-2026-78847 is a critical vulnerability published on September 21, 2026. 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.
When was CVE-2026-78847 disclosed?
CVE-2026-78847 was first published on September 21, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78847 actively exploited?
CVE-2026-78847 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (46th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78847?
CVE-2026-78847 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-78847?
No fix for CVE-2026-78847 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-78847 are linked in the Vendor Advisories panel on this page.

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