CVE-2026-84515

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to kernel memory corruption.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
6%
KEV
Not listed

Published

September 14, 2026

Last Modified

September 16, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
No patch confirmed yet.
generic

About the security content of macOS Sequoia 15.8 - Apple Support

https://support.apple.com/en-us/149043
generic

About the security content of macOS Tahoe 26.7 - Apple Support

https://support.apple.com/en-us/149042
generic

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

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

Vendor Advisories for CVE-2026-84515(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 25× in last 7d / 45× 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 11:21 UTCGHSA enrichment
  2. 2026-09-24 23:05 UTCEG score recompute
  3. 2026-09-24 23:05 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 10:49 UTCGHSA enrichment
  6. 2026-09-23 22:33 UTCGHSA enrichment
  7. 2026-09-23 10:18 UTCGHSA enrichment
  8. 2026-09-22 22:02 UTCEG score recompute
  9. 2026-09-22 22:02 UTCGHSA enrichment
  10. 2026-09-22 16:01 UTCEPSS rescore
  11. 2026-09-22 09:46 UTCGHSA enrichment
  12. 2026-09-21 21:30 UTCEG score recompute
  13. 2026-09-21 21:30 UTCGHSA enrichment
  14. 2026-09-21 21:09 UTCEPSS rescore
  15. 2026-09-21 09:14 UTCGHSA enrichment
  16. 2026-09-20 20:59 UTCEG score recompute
  17. 2026-09-20 20:58 UTCGHSA enrichment
  18. 2026-09-20 20:16 UTCEPSS rescore
  19. 2026-09-20 08:43 UTCGHSA enrichment
  20. 2026-09-19 20:27 UTCEG score recompute
  21. 2026-09-19 20:27 UTCGHSA enrichment
  22. 2026-09-19 08:11 UTCGHSA enrichment
  23. 2026-09-18 19:56 UTCEG score recompute
  24. 2026-09-18 19:56 UTCGHSA enrichment
  25. 2026-09-18 19:28 UTCEPSS rescore
Show 20 more
  1. 2026-09-18 07:40 UTCEG score recompute
  2. 2026-09-18 07:40 UTCGHSA enrichment
  3. 2026-09-17 19:32 UTCEPSS rescore
  4. 2026-09-17 19:24 UTCGHSA enrichment
  5. 2026-09-17 06:41 UTCGHSA enrichment
  6. 2026-09-16 18:05 UTCGHSA enrichment
  7. 2026-09-16 17:56 UTCEG score recompute
  8. 2026-09-16 17:55 UTCGHSA enrichment
  9. 2026-09-16 14:09 UTCEPSS rescore
  10. 2026-09-16 05:15 UTCEPSS rescore
  11. 2026-09-16 04:22 UTCEG score recompute
  12. 2026-09-16 04:22 UTCGHSA enrichment
  13. 2026-09-15 19:39 UTCGHSA enrichment
  14. 2026-09-15 18:40 UTCEG score recompute▲ 7.80
  15. 2026-09-15 18:40 UTCGHSA enrichment
  16. 2026-09-15 18:37 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  17. 2026-09-15 14:55 UTCGHSA enrichment
  18. 2026-09-14 21:22 UTCNVD update
  19. 2026-09-14 20:56 UTCEG score recompute
  20. 2026-09-14 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84515?
CVE-2026-84515 is a high vulnerability published on September 14, 2026. An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to kernel memory corruption.
When was CVE-2026-84515 disclosed?
CVE-2026-84515 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-2026-84515 actively exploited?
CVE-2026-84515 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 94.2% of all scored CVEs.
What is the CVSS score of CVE-2026-84515?
CVE-2026-84515 has a CVSS v3.1 base score of 7.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-84515?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84515, 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-2026-84515

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