CVE-2026-28931

CRITICALPre-NVD 8.89.8▲
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-27. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 1.0.

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: 8.8Exploit: 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 bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, watchOS 26.6. Connecting to a malicious NFS server may lead to kernel memory corruption.

CVSS v3
8.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

July 27, 2026

Last Modified

July 29, 2026

Advisory Details (4)

Auto-updated Jul 28, 2026
No patch confirmed yet.
generic

About the security content of tvOS 26.6 - Apple Support

https://support.apple.com/en-us/128069
generic

About the security content of watchOS 26.6 - Apple Support

https://support.apple.com/en-us/128068
generic

About the security content of macOS Tahoe 26.6 - Apple Support

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

About the security content of iOS 26.6 and iPadOS 26.6 - Apple Support

https://support.apple.com/en-us/128066

Vendor Advisories for CVE-2026-28931(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 34× in last 7d / 159× 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 315 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-28931?
CVE-2026-28931 is a critical vulnerability published on July 27, 2026. A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, watchOS 26.6. Connecting to a malicious NFS server may lead to kernel memory corruption.
When was CVE-2026-28931 disclosed?
CVE-2026-28931 was first published in the National Vulnerability Database on July 27, 2026, with the most recent update on July 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28931 actively exploited?
CVE-2026-28931 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 63.0% of all scored CVEs.
What is the CVSS score of CVE-2026-28931?
CVE-2026-28931 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-28931?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28931, 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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