CVE-2026-56179

HIGHPre-NVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-08-11. the CNA's CVSS baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:microsoft, epss, ghsa
Trending — 4 sources updated this week
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.3Exploit: None knownExposed: 0

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

Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.

CVSS v3
8.3
EG Score
8.3(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity83% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

August 11, 2026

Last Modified

September 16, 2026

Advisory Details (1)

Auto-updated Aug 11, 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-2026-56179

Vendor Advisories for CVE-2026-56179(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 42× in last 7d / 191× 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 321 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56179?
CVE-2026-56179 is a high vulnerability published on August 11, 2026. Origin validation error in Windows Network Address Translation (NAT) allows an unauthorized attacker to perform spoofing over an adjacent network.
When was CVE-2026-56179 disclosed?
CVE-2026-56179 was first published in the National Vulnerability Database on August 11, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56179 actively exploited?
CVE-2026-56179 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 85.4% of all scored CVEs.
What is the CVSS score of CVE-2026-56179?
CVE-2026-56179 has a CVSS v4.0 base score of 8.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-56179?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56179, 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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