CVE-2026-84543

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

An out-of-bounds access 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 cause unexpected system termination or corrupt kernel memory.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Track)
EG Risk 65/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
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-2026-84543(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 27× in last 7d / 46× 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 08:14 UTCGHSA enrichment
  2. 2026-09-24 19:57 UTCEG score recompute
  3. 2026-09-24 19:57 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 07:40 UTCGHSA enrichment
  6. 2026-09-23 19:22 UTCEG score recompute
  7. 2026-09-23 19:22 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 06:45 UTCGHSA enrichment
  10. 2026-09-22 18:27 UTCEG score recompute
  11. 2026-09-22 18:27 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 06:10 UTCEG score recompute
  14. 2026-09-22 06:10 UTCGHSA enrichment
  15. 2026-09-21 21:09 UTCEPSS rescore
  16. 2026-09-21 17:53 UTCGHSA enrichment
  17. 2026-09-21 05:36 UTCEG score recompute
  18. 2026-09-21 05:36 UTCGHSA enrichment
  19. 2026-09-20 20:16 UTCEPSS rescore
  20. 2026-09-20 17:18 UTCGHSA enrichment
  21. 2026-09-20 05:01 UTCGHSA enrichment
  22. 2026-09-19 16:44 UTCEG score recompute
  23. 2026-09-19 16:44 UTCGHSA enrichment
  24. 2026-09-19 04:26 UTCEG score recompute
  25. 2026-09-19 04:26 UTCGHSA enrichment
Show 21 more
  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 16:09 UTCGHSA enrichment
  3. 2026-09-18 03:49 UTCEG score recompute
  4. 2026-09-18 03:49 UTCGHSA enrichment
  5. 2026-09-17 19:32 UTCEPSS rescore
  6. 2026-09-17 15:32 UTCGHSA enrichment
  7. 2026-09-17 03:15 UTCGHSA enrichment
  8. 2026-09-16 14:58 UTCEG score recompute
  9. 2026-09-16 14:58 UTCGHSA enrichment
  10. 2026-09-16 14:09 UTCEPSS rescore
  11. 2026-09-16 08:48 UTCEG score recompute
  12. 2026-09-16 08:48 UTCGHSA enrichment
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 19:39 UTCGHSA enrichment
  15. 2026-09-15 18:24 UTCEG score recompute▲ 7.50
  16. 2026-09-15 18:23 UTCGHSA enrichment
  17. 2026-09-15 18:22 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  18. 2026-09-15 14:54 UTCGHSA enrichment
  19. 2026-09-14 21:22 UTCNVD update
  20. 2026-09-14 20:55 UTCEG score recompute
  21. 2026-09-14 20:54 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCpetermalone/CVE-2026-84543
    First seen Sep 24, 2026

    Technical disclosure and PoC for CVE-2026-84543, a macOS SMB kernel vulnerability

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84543?
CVE-2026-84543 is a high vulnerability published on September 14, 2026. An out-of-bounds access 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 cause unexpected system termination or corrupt kernel memory.
When was CVE-2026-84543 disclosed?
CVE-2026-84543 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-2026-84543 actively exploited?
CVE-2026-84543 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 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-84543?
CVE-2026-84543 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-84543?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-84543, 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-2026-84543

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