CVE-2026-56159

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 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 Windows DHCP Server allows an unauthorized attacker to execute code over a network.

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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
59%
KEV
Not listed

Published

July 14, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 28, 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-2026-56159

Vendor Advisories for CVE-2026-56159(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 59× in last 7d / 341× 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 464 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56159?
CVE-2026-56159 is a critical vulnerability published on July 14, 2026. Heap-based buffer overflow in Windows DHCP Server allows an unauthorized attacker to execute code over a network.
When was CVE-2026-56159 disclosed?
CVE-2026-56159 was first published in the National Vulnerability Database on July 14, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56159 actively exploited?
CVE-2026-56159 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 40.9% of all scored CVEs.
What is the CVSS score of CVE-2026-56159?
CVE-2026-56159 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-56159?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56159, 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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