CVE-2026-55944

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-14. The CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 4 sources updated this week
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.5%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

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.
Exploitation1.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
1.5%
EPSS %ILE
74th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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-2026-55944

Vendor Advisories for CVE-2026-55944(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 / 67× 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 627 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 527 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-14 10:48 UTCEG score recompute
  2. 2026-10-14 10:48 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  4. 2026-10-13 08:51 UTCEG score recompute
  5. 2026-10-13 08:51 UTCVendor advisory
  6. 2026-10-13 08:50 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  7. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  8. 2026-10-12 15:55 UTCEG score recompute
  9. 2026-10-12 06:52 UTCVendor advisory
  10. 2026-10-12 06:52 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-11 19:38 UTCEG score recompute
  12. 2026-10-11 16:53 UTCEG score recompute
  13. 2026-10-11 14:16 UTCEG score recompute
  14. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  17. 2026-10-08 19:19 UTCEG score recompute
  18. 2026-10-08 19:19 UTCVendor advisory
  19. 2026-10-08 19:19 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  21. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.5% · 74th percentile
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  23. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  24. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  25. 2026-10-02 17:56 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
Show 75 more
  1. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  2. 2026-10-01 12:56 UTCEG score recompute
  3. 2026-10-01 12:56 UTCVendor advisory
  4. 2026-10-01 12:56 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  6. 2026-09-29 15:22 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  8. 2026-09-28 13:16 UTCVendor advisory
  9. 2026-09-28 13:16 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  10. 2026-09-28 09:03 UTCEG score recompute
  11. 2026-09-28 09:03 UTCVendor advisory
  12. 2026-09-28 09:03 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  13. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  14. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  15. 2026-09-25 18:43 UTCEG score recompute
  16. 2026-09-25 18:43 UTCVendor advisory
  17. 2026-09-25 18:43 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  18. 2026-09-24 14:04 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  19. 2026-09-24 09:05 UTCEG score recompute
  20. 2026-09-24 09:05 UTCVendor advisory
  21. 2026-09-24 09:05 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-09-23 17:54 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  23. 2026-09-23 11:42 UTCVendor advisory
  24. 2026-09-23 11:42 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  25. 2026-09-23 07:36 UTCVendor advisory
  26. 2026-09-23 07:36 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  27. 2026-09-23 03:36 UTCEG score recompute
  28. 2026-09-23 03:36 UTCVendor advisory
  29. 2026-09-23 03:36 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  30. 2026-09-20 20:16 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  31. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  32. 2026-09-18 10:01 UTCVendor advisory
  33. 2026-09-18 10:01 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  34. 2026-09-18 04:53 UTCVendor advisory
  35. 2026-09-18 04:53 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  36. 2026-09-17 23:00 UTCEG score recompute
  37. 2026-09-17 23:00 UTCVendor advisory
  38. 2026-09-17 23:00 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  39. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  40. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  41. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  42. 2026-09-15 03:11 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  43. 2026-09-14 11:18 UTCVendor advisory
  44. 2026-09-14 11:18 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  45. 2026-09-14 07:18 UTCVendor advisory
  46. 2026-09-14 07:18 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  47. 2026-09-14 03:18 UTCVendor advisory
  48. 2026-09-14 03:18 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  49. 2026-09-13 23:18 UTCEG score recompute
  50. 2026-09-13 23:18 UTCVendor advisory
  51. 2026-09-13 23:18 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  53. 2026-09-13 16:26 UTCVendor advisory
  54. 2026-09-13 16:26 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  55. 2026-09-13 11:50 UTCVendor advisory
  56. 2026-09-13 11:50 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  57. 2026-09-13 07:43 UTCEG score recompute
  58. 2026-09-13 07:43 UTCVendor advisory
  59. 2026-09-13 07:43 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  60. 2026-09-12 13:14 UTCVendor advisory
  61. 2026-09-12 13:14 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-09-12 07:27 UTCVendor advisory
  63. 2026-09-12 07:27 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-09-12 01:22 UTCEG score recompute
  65. 2026-09-12 01:22 UTCVendor advisory
  66. 2026-09-12 01:22 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  68. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  69. 2026-09-09 22:43 UTCEG score recompute
  70. 2026-09-09 22:43 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  71. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.5% · 73rd percentile
  72. 2026-09-08 21:09 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  73. 2026-09-08 20:25 UTCGHSA enrichmentGHSA-rvmx-r962-429w · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-09-08 01:19 UTCEG score recompute
  75. 2026-09-08 01:19 UTCVendor advisory

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-55944?
CVE-2026-55944 is a critical-severity vulnerability; its CVE record was published on July 14, 2026. Deserialization of untrusted data in Microsoft Dynamics NAV allows an unauthorized attacker to execute code over a network.
When was CVE-2026-55944 made public?
CVE-2026-55944 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-2026-55944 actively exploited?
CVE-2026-55944 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.5% probability of exploitation in the next 30 days (74th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55944?
CVE-2026-55944 has a CVSS base score of 9.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-55944?
A fix for CVE-2026-55944 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55944 are linked in the Vendor Advisories panel on this page.

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