CVE-2026-108446

HIGHPre-NVD 8.88.8
EchelonGraph scoreHIGH confidence

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

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-10-15. The CNA's CVSS baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory
Trending — 5 sources updated this week
8.8EG
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: 0.4%CVSS: 8.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

CVSS v3
8.8
EG Score
8.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100

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)
Severity88% × 45%
Impact severity (EG Severity): CVSS 8.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 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
0.4%
EPSS %ILE
36th
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 (8.8): severity, escalated by confirmed exploitation. This CVE's 8.8 is its impact severity (EG Severity), not escalated.

EG Severity
8.8 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-21). 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

October 15, 2026

Last Modified

October 21, 2026

Advisory Details (1)

Auto-updated Oct 15, 2026
Patch available. Sources: microsoft.
Microsoft

Security Update Guide - Microsoft Security Response Center

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108446

Vendor Advisories for CVE-2026-108446(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 47× in last 7d / 47× 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.

  1. 2026-10-21 20:59 UTCVendor advisory
  2. 2026-10-21 20:59 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  3. 2026-10-21 16:43 UTCEG score recompute
  4. 2026-10-21 16:43 UTCVendor advisory
  5. 2026-10-21 16:43 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  6. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-10-20 22:23 UTCVendor advisory
  8. 2026-10-20 22:23 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-10-20 18:47 UTCEG score recompute
  10. 2026-10-20 18:47 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  11. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-19 23:58 UTCEG score recompute
  13. 2026-10-19 23:58 UTCVendor advisory
  14. 2026-10-19 23:58 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-10-19 20:47 UTCEG score recompute
  16. 2026-10-19 20:47 UTCVendor advisory
  17. 2026-10-19 20:47 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  18. 2026-10-19 19:48 UTCEG score recompute
  19. 2026-10-19 19:48 UTCVendor advisory
  20. 2026-10-19 19:48 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  21. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  22. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  23. 2026-10-18 05:07 UTCEG score recompute
  24. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-17 04:28 UTCEG score recompute
Show 22 more
  1. 2026-10-17 04:28 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  2. 2026-10-17 04:04 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  3. 2026-10-16 23:44 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  4. 2026-10-16 21:44 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  5. 2026-10-16 20:58 UTCEG score recompute
  6. 2026-10-16 20:58 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  7. 2026-10-16 19:33 UTCEG score recompute
  8. 2026-10-16 19:32 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  9. 2026-10-16 17:39 UTCEG score recompute
  10. 2026-10-16 17:39 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  11. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-16 16:12 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  13. 2026-10-16 13:33 UTCEG score recompute
  14. 2026-10-16 13:32 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  15. 2026-10-16 03:27 UTCEG score recompute
  16. 2026-10-16 03:27 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  17. 2026-10-15 22:35 UTCEG score recompute
  18. 2026-10-15 22:35 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  19. 2026-10-15 21:47 UTCEG score recompute
  20. 2026-10-15 21:47 UTCGHSA enrichmentGHSA-q438-8jwr-4rqf · GitHub severity HIGH · GitHub CVSS 8.8
  21. 2026-10-15 21:05 UTCEG score recomputeFirst assessed: 8.8 HIGH
  22. 2026-10-15 21:02 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-108446?
CVE-2026-108446 is a high-severity vulnerability; its CVE record was published on October 15, 2026. Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
When was CVE-2026-108446 made public?
CVE-2026-108446 was made public on October 15, 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 October 15, 2026. EchelonGraph's copy of the record carries a last-modified date of October 21, 2026; the record at its source may have been updated since.
Is CVE-2026-108446 actively exploited?
CVE-2026-108446 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-108446?
CVE-2026-108446 has a CVSS base score of 8.8 (the CNA's own assessment, by microsoft; NVD's own analysis pending).
How do I remediate CVE-2026-108446?
A fix for CVE-2026-108446 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-108446 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-108446

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