CVE-2026-84520

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-14. 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 week
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Golden Gate 27. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
No patch confirmed yet.
generic

About the security content of macOS Golden Gate 27 - Apple Support

https://support.apple.com/en-us/149035

Vendor Advisories for CVE-2026-84520(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 57× in last 7d / 81× 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.

  1. 2026-09-25 11:27 UTCGHSA enrichment
  2. 2026-09-25 07:38 UTCGHSA enrichment
  3. 2026-09-25 03:49 UTCGHSA enrichment
  4. 2026-09-25 00:01 UTCGHSA enrichment
  5. 2026-09-24 19:58 UTCGHSA enrichment
  6. 2026-09-24 16:09 UTCEG score recompute
  7. 2026-09-24 16:09 UTCGHSA enrichment
  8. 2026-09-24 14:04 UTCEPSS rescore
  9. 2026-09-24 12:20 UTCGHSA enrichment
  10. 2026-09-24 08:31 UTCGHSA enrichment
  11. 2026-09-24 04:42 UTCGHSA enrichment
  12. 2026-09-24 00:53 UTCGHSA enrichment
  13. 2026-09-23 21:05 UTCEG score recompute
  14. 2026-09-23 21:05 UTCGHSA enrichment
  15. 2026-09-23 17:54 UTCEPSS rescore
  16. 2026-09-23 17:16 UTCGHSA enrichment
  17. 2026-09-23 13:28 UTCGHSA enrichment
  18. 2026-09-23 09:39 UTCGHSA enrichment
  19. 2026-09-23 05:50 UTCGHSA enrichment
  20. 2026-09-23 02:01 UTCGHSA enrichment
  21. 2026-09-22 22:13 UTCGHSA enrichment
  22. 2026-09-22 18:23 UTCEG score recompute
  23. 2026-09-22 18:23 UTCGHSA enrichment
  24. 2026-09-22 16:01 UTCEPSS rescore
  25. 2026-09-22 14:35 UTCGHSA enrichment
Show 56 more
  1. 2026-09-22 10:45 UTCGHSA enrichment
  2. 2026-09-22 06:56 UTCGHSA enrichment
  3. 2026-09-22 03:08 UTCGHSA enrichment
  4. 2026-09-21 23:19 UTCEG score recompute
  5. 2026-09-21 23:19 UTCGHSA enrichment
  6. 2026-09-21 21:09 UTCEPSS rescore
  7. 2026-09-21 19:31 UTCGHSA enrichment
  8. 2026-09-21 15:39 UTCGHSA enrichment
  9. 2026-09-21 11:50 UTCGHSA enrichment
  10. 2026-09-21 08:01 UTCGHSA enrichment
  11. 2026-09-21 04:12 UTCGHSA enrichment
  12. 2026-09-21 00:24 UTCGHSA enrichment
  13. 2026-09-20 20:35 UTCEG score recompute
  14. 2026-09-20 20:35 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 16:46 UTCGHSA enrichment
  17. 2026-09-20 12:54 UTCGHSA enrichment
  18. 2026-09-20 09:03 UTCGHSA enrichment
  19. 2026-09-20 05:14 UTCGHSA enrichment
  20. 2026-09-20 01:26 UTCGHSA enrichment
  21. 2026-09-19 21:37 UTCGHSA enrichment
  22. 2026-09-19 17:48 UTCEG score recompute
  23. 2026-09-19 17:48 UTCGHSA enrichment
  24. 2026-09-19 13:59 UTCGHSA enrichment
  25. 2026-09-19 10:10 UTCGHSA enrichment
  26. 2026-09-19 06:22 UTCGHSA enrichment
  27. 2026-09-19 02:33 UTCGHSA enrichment
  28. 2026-09-18 22:43 UTCEG score recompute
  29. 2026-09-18 22:43 UTCGHSA enrichment
  30. 2026-09-18 19:28 UTCEPSS rescore
  31. 2026-09-18 18:55 UTCGHSA enrichment
  32. 2026-09-18 15:06 UTCGHSA enrichment
  33. 2026-09-18 11:17 UTCGHSA enrichment
  34. 2026-09-18 07:28 UTCGHSA enrichment
  35. 2026-09-18 03:39 UTCGHSA enrichment
  36. 2026-09-17 23:51 UTCEG score recompute
  37. 2026-09-17 23:51 UTCGHSA enrichment
  38. 2026-09-17 19:32 UTCEPSS rescore
  39. 2026-09-17 19:25 UTCGHSA enrichment
  40. 2026-09-17 12:57 UTCGHSA enrichment
  41. 2026-09-17 09:06 UTCGHSA enrichment
  42. 2026-09-17 05:17 UTCGHSA enrichment
  43. 2026-09-17 01:29 UTCGHSA enrichment
  44. 2026-09-16 21:40 UTCGHSA enrichment
  45. 2026-09-16 17:51 UTCEG score recompute
  46. 2026-09-16 17:51 UTCGHSA enrichment
  47. 2026-09-16 15:28 UTCGHSA enrichment
  48. 2026-09-16 14:50 UTCEG score recompute▲ 9.80
  49. 2026-09-16 14:50 UTCGHSA enrichment
  50. 2026-09-16 14:45 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  51. 2026-09-16 14:09 UTCEPSS rescore
  52. 2026-09-16 05:15 UTCEPSS rescore
  53. 2026-09-15 15:00 UTCGHSA enrichment
  54. 2026-09-14 21:22 UTCNVD update
  55. 2026-09-14 20:59 UTCEG score recompute
  56. 2026-09-14 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84520?
CVE-2026-84520 is a critical vulnerability published on September 14, 2026. A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Golden Gate 27. A local attacker may be able to cause unexpected system termination or corrupt kernel memory.
When was CVE-2026-84520 disclosed?
CVE-2026-84520 was first published in the National Vulnerability Database on September 14, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-84520 actively exploited?
CVE-2026-84520 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 64.1% of all scored CVEs.
What is the CVSS score of CVE-2026-84520?
CVE-2026-84520 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-84520?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84520, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-84520

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