CVE-2026-43773

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-27. 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: 1%CVSS: 9.8Exploit: 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 read 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. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.

CVSS v3
9.8
EG Score
9.8(medium)
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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
46%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 28, 2026

Advisory Details (3)

Auto-updated Aug 25, 2026
No patch confirmed yet.
generic

About the security content of macOS Sonoma 14.8.8 - Apple Support

https://support.apple.com/en-us/128072
generic

About the security content of macOS Sequoia 15.7.8 - Apple Support

https://support.apple.com/en-us/128071
generic

About the security content of macOS Tahoe 26.6 - Apple Support

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

Vendor Advisories for CVE-2026-43773(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 43× in last 7d / 227× 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 258 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-43773?
CVE-2026-43773 is a critical vulnerability published on July 27, 2026. An out-of-bounds read 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. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.
When was CVE-2026-43773 disclosed?
CVE-2026-43773 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on July 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43773 actively exploited?
CVE-2026-43773 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 53.9% of all scored CVEs.
What is the CVSS score of CVE-2026-43773?
CVE-2026-43773 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-43773?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43773, 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.

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