CVE-2026-64691

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: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Tahoe 26.6. An app may be able to cause 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%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 28, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

About the security content of macOS Tahoe 26.6 - Apple Support

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

Vendor Advisories for CVE-2026-64691(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 33× in last 7d / 155× 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 312 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-64691?
CVE-2026-64691 is a critical vulnerability published on July 27, 2026. A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Tahoe 26.6. An app may be able to cause unexpected system termination.
When was CVE-2026-64691 disclosed?
CVE-2026-64691 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-2026-64691 actively exploited?
CVE-2026-64691 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 62.2% of all scored CVEs.
What is the CVSS score of CVE-2026-64691?
CVE-2026-64691 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-64691?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64691, 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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