CVE-2026-77888

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. the CNA's CVSS baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 18, 2026

Advisory Details (1)

Auto-updated Sep 8, 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-2026-77888

Vendor Advisories for CVE-2026-77888(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 53× in last 7d / 91× 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.

  1. 2026-09-19 18:59 UTCEG score recompute
  2. 2026-09-19 18:59 UTCVendor advisory
  3. 2026-09-19 18:59 UTCGHSA enrichment
  4. 2026-09-19 08:03 UTCVendor advisory
  5. 2026-09-19 08:03 UTCGHSA enrichment
  6. 2026-09-18 21:08 UTCEG score recompute
  7. 2026-09-18 21:08 UTCVendor advisory
  8. 2026-09-18 21:08 UTCGHSA enrichment
  9. 2026-09-18 19:28 UTCEPSS rescore
  10. 2026-09-18 14:14 UTCVendor advisory
  11. 2026-09-18 14:14 UTCGHSA enrichment
  12. 2026-09-18 10:05 UTCVendor advisory
  13. 2026-09-18 10:05 UTCGHSA enrichment
  14. 2026-09-17 23:09 UTCVendor advisory
  15. 2026-09-17 23:09 UTCGHSA enrichment
  16. 2026-09-17 19:56 UTCEG score recompute
  17. 2026-09-17 19:56 UTCVendor advisory
  18. 2026-09-17 19:56 UTCGHSA enrichment
  19. 2026-09-17 09:09 UTCVendor advisory
  20. 2026-09-17 09:09 UTCGHSA enrichment
  21. 2026-09-16 22:14 UTCEG score recompute
  22. 2026-09-16 22:14 UTCVendor advisory
  23. 2026-09-16 22:14 UTCGHSA enrichment
  24. 2026-09-16 15:31 UTCEG score recompute
  25. 2026-09-16 15:31 UTCVendor advisory
Show 66 more
  1. 2026-09-16 15:31 UTCGHSA enrichment
  2. 2026-09-16 14:08 UTCEPSS rescore
  3. 2026-09-16 10:03 UTCEG score recompute
  4. 2026-09-16 10:03 UTCVendor advisory
  5. 2026-09-16 10:03 UTCGHSA enrichment
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 23:07 UTCVendor advisory
  8. 2026-09-15 23:07 UTCGHSA enrichment
  9. 2026-09-15 18:02 UTCVendor advisory
  10. 2026-09-15 18:02 UTCGHSA enrichment
  11. 2026-09-15 10:12 UTCEG score recompute
  12. 2026-09-15 10:12 UTCVendor advisory
  13. 2026-09-15 10:12 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 23:16 UTCVendor advisory
  17. 2026-09-14 23:16 UTCGHSA enrichment
  18. 2026-09-14 17:51 UTCVendor advisory
  19. 2026-09-14 17:51 UTCGHSA enrichment
  20. 2026-09-14 16:34 UTCVendor advisory
  21. 2026-09-14 16:34 UTCGHSA enrichment
  22. 2026-09-14 05:38 UTCVendor advisory
  23. 2026-09-14 05:38 UTCGHSA enrichment
  24. 2026-09-13 18:43 UTCEG score recompute
  25. 2026-09-13 18:43 UTCVendor advisory
  26. 2026-09-13 18:43 UTCGHSA enrichment
  27. 2026-09-13 07:47 UTCVendor advisory
  28. 2026-09-13 07:47 UTCGHSA enrichment
  29. 2026-09-12 20:53 UTCEG score recompute
  30. 2026-09-12 20:53 UTCVendor advisory
  31. 2026-09-12 20:53 UTCGHSA enrichment
  32. 2026-09-12 09:57 UTCVendor advisory
  33. 2026-09-12 09:57 UTCGHSA enrichment
  34. 2026-09-11 23:02 UTCVendor advisory
  35. 2026-09-11 23:02 UTCGHSA enrichment
  36. 2026-09-11 19:44 UTCVendor advisory
  37. 2026-09-11 19:44 UTCGHSA enrichment
  38. 2026-09-11 17:05 UTCEG score recompute
  39. 2026-09-11 17:05 UTCVendor advisory
  40. 2026-09-11 17:05 UTCGHSA enrichment
  41. 2026-09-11 14:53 UTCEPSS rescore
  42. 2026-09-11 10:41 UTCEG score recompute
  43. 2026-09-11 10:41 UTCGHSA enrichment
  44. 2026-09-10 23:39 UTCGHSA enrichment
  45. 2026-09-10 20:26 UTCEG score recompute
  46. 2026-09-10 20:26 UTCGHSA enrichment
  47. 2026-09-10 09:35 UTCEPSS rescore
  48. 2026-09-10 09:30 UTCGHSA enrichment
  49. 2026-09-09 22:31 UTCGHSA enrichment
  50. 2026-09-09 20:13 UTCVendor advisory
  51. 2026-09-09 20:13 UTCGHSA enrichment
  52. 2026-09-09 11:05 UTCVendor advisory
  53. 2026-09-09 11:05 UTCGHSA enrichment
  54. 2026-09-09 00:10 UTCEG score recompute
  55. 2026-09-09 00:10 UTCVendor advisory
  56. 2026-09-09 00:10 UTCGHSA enrichment
  57. 2026-09-08 21:50 UTCEG score recompute
  58. 2026-09-08 21:50 UTCVendor advisory
  59. 2026-09-08 21:50 UTCGHSA enrichment
  60. 2026-09-08 20:55 UTCEG score recompute
  61. 2026-09-08 20:55 UTCGHSA enrichment
  62. 2026-09-08 19:03 UTCEG score recompute
  63. 2026-09-08 19:02 UTCGHSA enrichment
  64. 2026-09-08 17:57 UTCEG score recompute
  65. 2026-09-08 17:57 UTCVendor advisory
  66. 2026-09-08 17:25 UTCMITRE cvelistV5first tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-77888?
CVE-2026-77888 is a high vulnerability published on September 8, 2026. Access of resource using incompatible type ('type confusion') in Windows DHCP Server allows an unauthorized attacker to deny service over a network.
When was CVE-2026-77888 disclosed?
CVE-2026-77888 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-2026-77888 actively exploited?
CVE-2026-77888 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 43.3% of all scored CVEs.
What is the CVSS score of CVE-2026-77888?
CVE-2026-77888 has a CVSS v4.0 base score of 7.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-77888?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77888, 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

Explore the affected products and dependency analysis for CVE-2026-77888

Explore →

Is Your Infrastructure Affected by CVE-2026-77888?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs