CVE-2026-43815

HIGHNVD 8.88.8
EchelonGraph scoreHIGH confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-14. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious afpfs server may lead to kernel memory corruption.

CVSS v3
8.8
EG Score
8.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100

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 (value × EchelonGraph’s weight)
Severity88% × 45%
The EG Score, 8.8 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: The CVE record names the fixed release. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
39th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 14, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
Fix named in the CVE record.
Web page

About the security content of macOS Sonoma 14.8.8 - Apple Support

https://support.apple.com/en-us/128072
Web page

About the security content of macOS Sequoia 15.7.8 - Apple Support

https://support.apple.com/en-us/128071
Web page

About the security content of macOS Tahoe 26.6 - Apple Support

https://support.apple.com/en-us/128067

Vendor Advisories for CVE-2026-43815(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 24× in last 7d / 110× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 110 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 10 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-12 16:05 UTCEG score recompute
  4. 2026-10-11 19:40 UTCEG score recompute
  5. 2026-10-11 19:39 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  6. 2026-10-11 17:02 UTCEG score recompute
  7. 2026-10-11 14:28 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  9. 2026-10-11 05:57 UTCEG score recompute
  10. 2026-10-11 05:56 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-10-10 15:55 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-10-10 03:53 UTCEG score recompute
  14. 2026-10-10 03:53 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-09 16:03 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  17. 2026-10-08 22:54 UTCEG score recompute
  18. 2026-10-08 22:54 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  19. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-08 11:04 UTCEG score recompute
  21. 2026-10-08 11:04 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  22. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-10-07 23:13 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  24. 2026-10-07 11:23 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  25. 2026-10-06 23:29 UTCEG score recompute
Show 75 more
  1. 2026-10-06 23:29 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  2. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-06 11:40 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  4. 2026-10-05 23:51 UTCEG score recompute
  5. 2026-10-05 23:51 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  6. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  7. 2026-10-05 11:41 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  8. 2026-10-04 23:53 UTCEG score recompute
  9. 2026-10-04 23:53 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-04 12:03 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  12. 2026-10-04 00:14 UTCEG score recompute
  13. 2026-10-04 00:13 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-03 12:24 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  16. 2026-10-03 00:35 UTCEG score recompute
  17. 2026-10-03 00:35 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-10-02 12:45 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  19. 2026-10-02 00:56 UTCEG score recompute
  20. 2026-10-02 00:56 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  21. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-10-01 12:54 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  23. 2026-10-01 01:05 UTCEG score recompute
  24. 2026-10-01 01:05 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  26. 2026-09-30 13:16 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  27. 2026-09-30 01:26 UTCEG score recompute
  28. 2026-09-30 01:26 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  29. 2026-09-29 13:28 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  30. 2026-09-29 01:33 UTCEG score recompute
  31. 2026-09-29 01:33 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  32. 2026-09-28 13:44 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  33. 2026-09-28 01:53 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  34. 2026-09-27 14:04 UTCEG score recompute
  35. 2026-09-27 14:04 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  36. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  37. 2026-09-27 02:05 UTCEG score recompute
  38. 2026-09-27 02:05 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  39. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  40. 2026-09-26 14:15 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  41. 2026-09-26 01:49 UTCEG score recompute
  42. 2026-09-26 01:48 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  43. 2026-09-25 13:57 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  44. 2026-09-25 02:06 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  45. 2026-09-24 14:16 UTCEG score recompute
  46. 2026-09-24 14:16 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  47. 2026-09-24 02:26 UTCEG score recompute
  48. 2026-09-24 02:26 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  49. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  50. 2026-09-23 14:38 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  51. 2026-09-23 02:48 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  52. 2026-09-22 14:59 UTCEG score recompute
  53. 2026-09-22 14:59 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  54. 2026-09-22 03:10 UTCEG score recompute
  55. 2026-09-22 03:10 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  56. 2026-09-21 15:20 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  57. 2026-09-21 03:31 UTCEG score recompute
  58. 2026-09-21 03:31 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  59. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  60. 2026-09-20 15:42 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  61. 2026-09-20 03:53 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  62. 2026-09-19 16:03 UTCEG score recompute
  63. 2026-09-19 16:03 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  64. 2026-09-19 04:14 UTCEG score recompute
  65. 2026-09-19 04:14 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  66. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  67. 2026-09-18 16:24 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  68. 2026-09-18 04:35 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  69. 2026-09-18 04:05 UTCEG score recompute
  70. 2026-09-18 04:05 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  71. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  72. 2026-09-17 18:26 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  73. 2026-09-17 18:09 UTCEG score recompute
  74. 2026-09-17 18:09 UTCGHSA enrichmentGHSA-85ff-jrm6-jh74 · GitHub severity HIGH · GitHub CVSS 8.8
  75. 2026-09-17 05:43 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43815?
CVE-2026-43815 is a high-severity vulnerability; its CVE record was published on September 14, 2026. A buffer overflow was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious afpfs server may lead to kernel memory corruption.
When was the CVE record for CVE-2026-43815 published?
The CVE record for CVE-2026-43815 was published on September 14, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-43815 actively exploited?
CVE-2026-43815 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (39th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43815?
CVE-2026-43815 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-43815?
The CVE record for CVE-2026-43815 names the fix: "This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6." The vendor advisories EchelonGraph has for CVE-2026-43815 are linked in the Vendor Advisories panel on this page.

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