CVE-2026-67631

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.7%, top 49% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: cna:microsoft, epss, ghsa
Trending — 5 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.

Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 18, 2026
Patch available. Sources: microsoft.
microsoft Patch Available

Security Update Guide - Microsoft Security Response Center

Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67631

Vendor Advisories for CVE-2026-67631(2)

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 82× in last 7d / 128× 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 128 total refreshes for this CVE.

  1. 2026-09-21 08:17 UTCVendor advisory
  2. 2026-09-21 08:17 UTCGHSA enrichment
  3. 2026-09-21 04:05 UTCVendor advisory
  4. 2026-09-21 04:05 UTCGHSA enrichment
  5. 2026-09-20 23:54 UTCEG score recompute
  6. 2026-09-20 23:54 UTCVendor advisory
  7. 2026-09-20 23:54 UTCGHSA enrichment
  8. 2026-09-20 20:16 UTCEPSS rescore
  9. 2026-09-20 19:42 UTCVendor advisory
  10. 2026-09-20 19:42 UTCGHSA enrichment
  11. 2026-09-20 15:31 UTCVendor advisory
  12. 2026-09-20 15:30 UTCGHSA enrichment
  13. 2026-09-20 11:19 UTCVendor advisory
  14. 2026-09-20 11:19 UTCGHSA enrichment
  15. 2026-09-20 07:07 UTCVendor advisory
  16. 2026-09-20 07:07 UTCGHSA enrichment
  17. 2026-09-20 02:41 UTCVendor advisory
  18. 2026-09-20 02:41 UTCGHSA enrichment
  19. 2026-09-19 22:29 UTCVendor advisory
  20. 2026-09-19 22:28 UTCGHSA enrichment
  21. 2026-09-19 18:17 UTCEG score recompute
  22. 2026-09-19 18:17 UTCVendor advisory
  23. 2026-09-19 18:17 UTCGHSA enrichment
  24. 2026-09-19 14:05 UTCVendor advisory
  25. 2026-09-19 14:05 UTCGHSA enrichment
Show 75 more
  1. 2026-09-19 09:54 UTCVendor advisory
  2. 2026-09-19 09:54 UTCGHSA enrichment
  3. 2026-09-19 05:35 UTCVendor advisory
  4. 2026-09-19 05:35 UTCGHSA enrichment
  5. 2026-09-19 01:24 UTCVendor advisory
  6. 2026-09-19 01:23 UTCGHSA enrichment
  7. 2026-09-18 21:12 UTCEG score recompute
  8. 2026-09-18 21:12 UTCVendor advisory
  9. 2026-09-18 21:12 UTCGHSA enrichment
  10. 2026-09-18 19:28 UTCEPSS rescore
  11. 2026-09-18 18:17 UTCVendor advisory
  12. 2026-09-18 18:17 UTCGHSA enrichment
  13. 2026-09-18 13:55 UTCVendor advisory
  14. 2026-09-18 13:55 UTCGHSA enrichment
  15. 2026-09-18 11:49 UTCVendor advisory
  16. 2026-09-18 11:49 UTCGHSA enrichment
  17. 2026-09-18 07:37 UTCVendor advisory
  18. 2026-09-18 07:37 UTCGHSA enrichment
  19. 2026-09-18 03:25 UTCVendor advisory
  20. 2026-09-18 03:25 UTCGHSA enrichment
  21. 2026-09-17 23:13 UTCEG score recompute
  22. 2026-09-17 23:13 UTCVendor advisory
  23. 2026-09-17 23:13 UTCGHSA enrichment
  24. 2026-09-17 20:18 UTCEG score recompute
  25. 2026-09-17 20:18 UTCVendor advisory
  26. 2026-09-17 20:18 UTCGHSA enrichment
  27. 2026-09-17 20:01 UTCEG score recompute▲ 1.00
  28. 2026-09-17 20:01 UTCVendor advisory
  29. 2026-09-17 20:01 UTCGHSA enrichment
  30. 2026-09-17 19:54 UTCMITRE cvelistV5CVSS v3 → 9.8 · severity → CRITICAL
  31. 2026-09-17 10:22 UTCVendor advisory
  32. 2026-09-17 10:22 UTCGHSA enrichment
  33. 2026-09-16 22:19 UTCEG score recompute
  34. 2026-09-16 22:19 UTCVendor advisory
  35. 2026-09-16 22:19 UTCGHSA enrichment
  36. 2026-09-16 14:08 UTCEPSS rescore
  37. 2026-09-16 11:19 UTCEG score recompute
  38. 2026-09-16 11:19 UTCVendor advisory
  39. 2026-09-16 11:18 UTCGHSA enrichment
  40. 2026-09-16 05:15 UTCEPSS rescore
  41. 2026-09-15 23:16 UTCEG score recompute
  42. 2026-09-15 23:16 UTCVendor advisory
  43. 2026-09-15 23:15 UTCGHSA enrichment
  44. 2026-09-15 19:12 UTCEG score recompute
  45. 2026-09-15 19:12 UTCVendor advisory
  46. 2026-09-15 19:12 UTCGHSA enrichment
  47. 2026-09-15 18:13 UTCVendor advisory
  48. 2026-09-15 18:13 UTCGHSA enrichment
  49. 2026-09-15 11:30 UTCEG score recompute
  50. 2026-09-15 11:30 UTCVendor advisory
  51. 2026-09-15 11:30 UTCGHSA enrichment
  52. 2026-09-14 23:26 UTCVendor advisory
  53. 2026-09-14 23:26 UTCGHSA enrichment
  54. 2026-09-14 17:53 UTCVendor advisory
  55. 2026-09-14 17:53 UTCGHSA enrichment
  56. 2026-09-14 11:25 UTCVendor advisory
  57. 2026-09-14 11:25 UTCGHSA enrichment
  58. 2026-09-13 23:22 UTCEG score recompute
  59. 2026-09-13 23:22 UTCVendor advisory
  60. 2026-09-13 23:22 UTCGHSA enrichment
  61. 2026-09-13 11:19 UTCVendor advisory
  62. 2026-09-13 11:19 UTCGHSA enrichment
  63. 2026-09-12 23:16 UTCEG score recompute
  64. 2026-09-12 23:16 UTCVendor advisory
  65. 2026-09-12 23:16 UTCGHSA enrichment
  66. 2026-09-12 11:13 UTCVendor advisory
  67. 2026-09-12 11:13 UTCGHSA enrichment
  68. 2026-09-11 23:10 UTCVendor advisory
  69. 2026-09-11 23:10 UTCGHSA enrichment
  70. 2026-09-11 20:07 UTCVendor advisory
  71. 2026-09-11 20:07 UTCGHSA enrichment
  72. 2026-09-11 17:11 UTCEG score recompute
  73. 2026-09-11 17:11 UTCVendor advisory
  74. 2026-09-11 17:11 UTCGHSA enrichment
  75. 2026-09-11 14:53 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67631?
CVE-2026-67631 is a critical vulnerability published on September 8, 2026. Heap-based buffer overflow in SQL Server allows an unauthorized attacker to execute code over a network.
When was CVE-2026-67631 disclosed?
CVE-2026-67631 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67631 actively exploited?
CVE-2026-67631 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 49.5% of all scored CVEs.
What is the CVSS score of CVE-2026-67631?
CVE-2026-67631 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-67631?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67631, 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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