CVE-2026-50357

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-07-14. The CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Numeric truncation error in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity78% × 45%
Impact severity (EG Severity): CVSS 7.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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 low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.3%
EPSS %ILE
25th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.8): severity, escalated by confirmed exploitation. This CVE's 7.8 is its impact severity (EG Severity), not escalated.

EG Severity
7.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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-2026-50357

Vendor Advisories for CVE-2026-50357(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 10× 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 354 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 254 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-18 03:33 UTCEG score recompute
  4. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-10-17 11:45 UTCEG score recompute
  6. 2026-10-17 11:45 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  7. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  12. 2026-10-12 15:59 UTCEG score recompute
  13. 2026-10-11 19:42 UTCEG score recompute
  14. 2026-10-11 16:57 UTCEG score recompute
  15. 2026-10-11 14:21 UTCEG score recompute
  16. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  19. 2026-10-08 19:28 UTCEG score recompute
  20. 2026-10-08 19:28 UTCVendor advisory
  21. 2026-10-08 19:28 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  23. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Show 75 more
  1. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  2. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  3. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  4. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  5. 2026-10-01 13:05 UTCEG score recompute
  6. 2026-10-01 13:05 UTCVendor advisory
  7. 2026-10-01 13:05 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  9. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  10. 2026-09-28 09:14 UTCEG score recompute
  11. 2026-09-28 09:14 UTCVendor advisory
  12. 2026-09-28 09:14 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  13. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  14. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  16. 2026-09-25 19:05 UTCEG score recompute
  17. 2026-09-25 19:05 UTCVendor advisory
  18. 2026-09-25 19:05 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  19. 2026-09-24 09:13 UTCEG score recompute
  20. 2026-09-24 09:13 UTCVendor advisory
  21. 2026-09-24 09:13 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  23. 2026-09-23 03:46 UTCEG score recompute
  24. 2026-09-23 03:46 UTCVendor advisory
  25. 2026-09-23 03:46 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  26. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  27. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  28. 2026-09-18 10:59 UTCVendor advisory
  29. 2026-09-18 10:59 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  30. 2026-09-17 23:16 UTCEG score recompute
  31. 2026-09-17 23:16 UTCVendor advisory
  32. 2026-09-17 23:16 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  33. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  34. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  35. 2026-09-14 11:02 UTCVendor advisory
  36. 2026-09-14 11:02 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  37. 2026-09-13 23:23 UTCEG score recompute
  38. 2026-09-13 23:23 UTCVendor advisory
  39. 2026-09-13 23:23 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  40. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  41. 2026-09-13 07:48 UTCEG score recompute
  42. 2026-09-13 07:48 UTCVendor advisory
  43. 2026-09-13 07:48 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-09-12 13:16 UTCVendor advisory
  45. 2026-09-12 13:16 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  46. 2026-09-12 01:30 UTCEG score recompute
  47. 2026-09-12 01:30 UTCVendor advisory
  48. 2026-09-12 01:30 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  49. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  50. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  51. 2026-09-09 22:50 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  52. 2026-09-08 22:01 UTCEG score recompute
  53. 2026-09-08 22:01 UTCVendor advisory
  54. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  55. 2026-09-08 22:00 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  56. 2026-09-08 01:32 UTCEG score recompute
  57. 2026-09-08 01:32 UTCVendor advisory
  58. 2026-09-08 01:32 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  59. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  60. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  61. 2026-09-06 13:42 UTCVendor advisory
  62. 2026-09-06 13:42 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  63. 2026-09-05 21:13 UTCEG score recompute
  64. 2026-09-05 21:13 UTCVendor advisory
  65. 2026-09-05 21:13 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-09-04 23:06 UTCEG score recompute
  67. 2026-09-04 23:06 UTCVendor advisory
  68. 2026-09-04 23:06 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  69. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  70. 2026-09-02 19:50 UTCEG score recompute
  71. 2026-09-02 19:50 UTCVendor advisory
  72. 2026-09-02 19:50 UTCGHSA enrichmentGHSA-cf3c-vrhx-r6wg · GitHub severity HIGH · GitHub CVSS 7.8
  73. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  74. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  75. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 25th percentile

Frequently asked(5)

What is CVE-2026-50357?
CVE-2026-50357 is a high-severity vulnerability; its CVE record was published on July 14, 2026. Numeric truncation error in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.
When was CVE-2026-50357 made public?
CVE-2026-50357 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-2026-50357 actively exploited?
CVE-2026-50357 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-50357?
CVE-2026-50357 has a CVSS base score of 7.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-50357?
A fix for CVE-2026-50357 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50357 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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