CVE-2026-39873

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.

The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious SMB server may lead to unexpected system termination.

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
42%
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-2026-39873(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 42× in last 7d / 222× 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 251 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-39873?
CVE-2026-39873 is a critical vulnerability published on July 27, 2026. The issue was addressed with improved memory handling. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Connecting to a malicious SMB server may lead to unexpected system termination.
When was CVE-2026-39873 disclosed?
CVE-2026-39873 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-2026-39873 actively exploited?
CVE-2026-39873 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 58.3% of all scored CVEs.
What is the CVSS score of CVE-2026-39873?
CVE-2026-39873 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-39873?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39873, 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

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