CVE-2026-54995

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.8% (55th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 8.1 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-14) is not newer than that change (2026-10-08), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week
9.8EG
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: 0.8%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

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)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation0.8% × 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
0.8%
EPSS %ILE
55th
KEV
Not listed

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 Oct 8, 2026
Patch available. Sources: microsoft.
MicrosoftMentions a patch (unverified)

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54995

Vendor Advisories for CVE-2026-54995(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 21× in last 7d / 68× 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 617 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 517 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 09:04 UTCEG score recompute
  2. 2026-10-14 09:03 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  4. 2026-10-13 05:51 UTCEG score recompute
  5. 2026-10-13 05:51 UTCVendor advisory
  6. 2026-10-13 05:51 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  8. 2026-10-12 15:56 UTCEG score recompute
  9. 2026-10-12 06:55 UTCVendor advisory
  10. 2026-10-12 06:55 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  11. 2026-10-11 19:39 UTCEG score recompute
  12. 2026-10-11 16:54 UTCEG score recompute
  13. 2026-10-11 14:17 UTCEG score recompute
  14. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  17. 2026-10-08 18:29 UTCEG score recompute
  18. 2026-10-08 18:29 UTCVendor advisory
  19. 2026-10-08 18:29 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  20. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  21. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  24. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  25. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 54th percentile
Show 75 more
  1. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  2. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  3. 2026-10-01 13:17 UTCEG score recompute
  4. 2026-10-01 13:17 UTCVendor advisory
  5. 2026-10-01 13:17 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  6. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  7. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  8. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  9. 2026-09-28 13:17 UTCVendor advisory
  10. 2026-09-28 13:17 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  11. 2026-09-28 09:18 UTCEG score recompute
  12. 2026-09-28 09:18 UTCVendor advisory
  13. 2026-09-28 09:18 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  14. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  15. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  16. 2026-09-25 19:10 UTCEG score recompute
  17. 2026-09-25 19:10 UTCVendor advisory
  18. 2026-09-25 19:10 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  19. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  20. 2026-09-24 09:22 UTCEG score recompute
  21. 2026-09-24 09:22 UTCVendor advisory
  22. 2026-09-24 09:22 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  24. 2026-09-23 11:25 UTCVendor advisory
  25. 2026-09-23 11:25 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  26. 2026-09-23 07:39 UTCVendor advisory
  27. 2026-09-23 07:39 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  28. 2026-09-23 03:52 UTCEG score recompute
  29. 2026-09-23 03:52 UTCVendor advisory
  30. 2026-09-23 03:52 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  31. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  32. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  33. 2026-09-18 10:02 UTCVendor advisory
  34. 2026-09-18 10:02 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  35. 2026-09-18 04:53 UTCVendor advisory
  36. 2026-09-18 04:53 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  37. 2026-09-17 23:18 UTCEG score recompute
  38. 2026-09-17 23:18 UTCVendor advisory
  39. 2026-09-17 23:18 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  40. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  41. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  42. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  43. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  44. 2026-09-14 11:02 UTCVendor advisory
  45. 2026-09-14 11:02 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  46. 2026-09-14 06:58 UTCVendor advisory
  47. 2026-09-14 06:58 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  48. 2026-09-14 03:11 UTCVendor advisory
  49. 2026-09-14 03:11 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-09-13 23:26 UTCEG score recompute
  51. 2026-09-13 23:26 UTCVendor advisory
  52. 2026-09-13 23:26 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  53. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  54. 2026-09-13 16:28 UTCVendor advisory
  55. 2026-09-13 16:28 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  56. 2026-09-13 11:51 UTCVendor advisory
  57. 2026-09-13 11:51 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-09-13 07:51 UTCVendor advisory
  59. 2026-09-13 07:51 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  60. 2026-09-12 17:09 UTCEG score recompute
  61. 2026-09-12 17:09 UTCVendor advisory
  62. 2026-09-12 17:09 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  63. 2026-09-12 13:18 UTCVendor advisory
  64. 2026-09-12 13:18 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  65. 2026-09-12 07:27 UTCVendor advisory
  66. 2026-09-12 07:27 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  67. 2026-09-12 01:43 UTCEG score recompute
  68. 2026-09-12 01:43 UTCVendor advisory
  69. 2026-09-12 01:43 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  70. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  71. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  72. 2026-09-09 22:55 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1
  73. 2026-09-08 22:50 UTCEG score recompute
  74. 2026-09-08 22:50 UTCVendor advisory
  75. 2026-09-08 22:49 UTCGHSA enrichmentGHSA-w75j-4mxv-mw59 · GitHub severity HIGH · GitHub CVSS 8.1

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-54995?
CVE-2026-54995 is a critical-severity vulnerability; its CVE record was published on July 14, 2026. Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.
When was CVE-2026-54995 made public?
CVE-2026-54995 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-2026-54995 actively exploited?
CVE-2026-54995 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (55th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54995?
CVE-2026-54995 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-54995?
A fix for CVE-2026-54995 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54995 are linked in the Vendor Advisories panel on this page.

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