CVE-2026-33840

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-12. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 7.8Exploit: None knownExposed: 0

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

Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity78% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
80%
KEV
Not listed

Published

May 12, 2026

Last Modified

August 10, 2026

Advisory Details (1)

Auto-updated May 13, 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-2026-33840

Vendor Advisories for CVE-2026-33840(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 7× in last 7d / 74× 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 277 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-33840?
CVE-2026-33840 is a high vulnerability published on May 12, 2026. Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
When was CVE-2026-33840 disclosed?
CVE-2026-33840 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on August 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33840 actively exploited?
CVE-2026-33840 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 20.4% of all scored CVEs.
What is the CVSS score of CVE-2026-33840?
CVE-2026-33840 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-33840?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33840, 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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