CVE-2026-56186

HIGHNVD 6.58.1
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. NVD baseline CVSS 6.5; sources differ by 1.6.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
8.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Out-of-bounds read in Windows Schannel allows an authorized attacker to disclose information over a network.

CVSS v3
6.5
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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 (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.1%
EPSS %ILE
64th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 14, 2026

Last Modified

October 8, 2026

Advisory Details (1)

Auto-updated Jul 14, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56186

Vendor Advisories for CVE-2026-56186(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 14× in last 7d / 51× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 334 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 234 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:38 UTCEG score recompute
  5. 2026-10-11 16:53 UTCEG score recompute
  6. 2026-10-11 14:16 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  10. 2026-10-08 19:19 UTCEG score recompute
  11. 2026-10-08 19:19 UTCVendor advisory
  12. 2026-10-08 19:19 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  18. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  19. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-10-01 12:56 UTCEG score recompute
  22. 2026-10-01 12:56 UTCVendor advisory
  23. 2026-10-01 12:56 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  25. 2026-09-29 15:22 UTCEPSS rescoreEPSS 1.1% · 64th percentile
Show 75 more
  1. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  2. 2026-09-28 09:02 UTCEG score recompute
  3. 2026-09-28 09:02 UTCVendor advisory
  4. 2026-09-28 09:02 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  5. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  6. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  7. 2026-09-25 18:42 UTCEG score recompute
  8. 2026-09-25 18:42 UTCVendor advisory
  9. 2026-09-25 18:42 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  10. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  11. 2026-09-24 09:05 UTCEG score recompute
  12. 2026-09-24 09:05 UTCVendor advisory
  13. 2026-09-24 09:05 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  14. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-09-23 03:35 UTCEG score recompute
  16. 2026-09-23 03:35 UTCVendor advisory
  17. 2026-09-23 03:35 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  18. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  19. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-09-17 22:59 UTCEG score recompute
  21. 2026-09-17 22:59 UTCVendor advisory
  22. 2026-09-17 22:58 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  26. 2026-09-15 03:11 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  27. 2026-09-13 23:18 UTCEG score recompute
  28. 2026-09-13 23:18 UTCVendor advisory
  29. 2026-09-13 23:18 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  30. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  31. 2026-09-13 07:42 UTCEG score recompute
  32. 2026-09-13 07:42 UTCVendor advisory
  33. 2026-09-13 07:42 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  34. 2026-09-12 14:18 UTCVendor advisory
  35. 2026-09-12 14:18 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  36. 2026-09-12 01:22 UTCEG score recompute
  37. 2026-09-12 01:22 UTCVendor advisory
  38. 2026-09-12 01:22 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  39. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  40. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  41. 2026-09-09 22:43 UTCEG score recompute
  42. 2026-09-09 22:43 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  43. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  44. 2026-09-08 21:08 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  45. 2026-09-08 20:25 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  46. 2026-09-08 01:18 UTCEG score recompute
  47. 2026-09-08 01:18 UTCVendor advisory
  48. 2026-09-08 01:18 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  49. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  50. 2026-09-06 13:37 UTCVendor advisory
  51. 2026-09-06 13:37 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  52. 2026-09-05 21:04 UTCEG score recompute
  53. 2026-09-05 21:04 UTCVendor advisory
  54. 2026-09-05 21:04 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  55. 2026-09-04 22:45 UTCEG score recompute
  56. 2026-09-04 22:45 UTCVendor advisory
  57. 2026-09-04 22:44 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-09-04 05:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  59. 2026-09-02 19:42 UTCEG score recompute
  60. 2026-09-02 19:42 UTCVendor advisory
  61. 2026-09-02 19:42 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  62. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  63. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  64. 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  65. 2026-08-31 15:44 UTCVendor advisory
  66. 2026-08-31 15:44 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  67. 2026-08-31 06:59 UTCEG score recompute
  68. 2026-08-31 06:59 UTCVendor advisory
  69. 2026-08-31 06:59 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  70. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  71. 2026-08-30 17:26 UTCVendor advisory
  72. 2026-08-30 17:26 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-08-30 04:30 UTCEG score recompute
  74. 2026-08-30 04:30 UTCVendor advisory
  75. 2026-08-30 04:30 UTCGHSA enrichmentGHSA-9hmw-8q29-cpgf · GitHub severity HIGH · GitHub CVSS 8.1

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56186?
CVE-2026-56186 is a high-severity vulnerability; its CVE record was published on July 14, 2026. Out-of-bounds read in Windows Schannel allows an authorized attacker to disclose information over a network.
When was CVE-2026-56186 made public?
CVE-2026-56186 was made public on July 14, 2026: that is the date its CVE record's CNA, Microsoft Corporation, gives for when the vulnerability was made public. The CVE record itself was published on July 14, 2026. EchelonGraph's copy of the record carries a last-modified date of October 8, 2026; the record at its source may have been updated since.
Is CVE-2026-56186 actively exploited?
CVE-2026-56186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (64th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-56186?
CVE-2026-56186 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.1 (HIGH).
How do I remediate CVE-2026-56186?
A fix for CVE-2026-56186 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-56186 are linked in the Vendor Advisories panel on this page.

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