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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.3Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

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
8.3HIGHmedium confidence
EG Risk
37
EG Risk 37/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 11, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
Fix referenced — no release confirmed yet. Sources: microsoft.
microsoftMentions a patch (unverified)

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 24× in last 7d / 153× 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 411 total refreshes for this CVE.

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

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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 on August 11, 2026, with the most recent update on October 8, 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 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56179?
CVE-2026-56179 has a CVSS base score of 8.3 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-56179?
A fix for CVE-2026-56179 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation. The vendor advisories EchelonGraph has for CVE-2026-56179 are linked in the Vendor Advisories panel on this page.

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