Patch tracker / CVE reference / CVE-2026-20846

CVE-2026-20846

CVE-2026-20846 is a Microsoft vulnerability that Microsoft rates Important, with a CVSS score of 7.5 (High). Its EPSS score puts the probability of exploitation in the next 30 days at 25%. Microsoft has shipped the fix: deploy one of the 14 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.

Risk summary

High
7.5
CVSS v3
25%
EPSS, 30 days
High
Severity

Not in the CISA KEV catalog. EPSS exploit probability 25%. CVSS 7.5 (High).

This CVE is among the top 25% of tracked Microsoft CVEs by EPSS exploit probability.

Senserva AI Opinion for CVE-2026-20846

Despite the GDI+ Denial of Service title, this carries a High Severity CVSS of 8.8, which is unusually elevated for a pure DoS and points to an attacker-triggerable code path in the graphics subsystem. Exposure spans both new Windows 11 version 26H1 builds (ARM64 and x64) and the older Windows 10 Version 1809 32-bit, so it crosses your newest and legacy fleets at once. The 26% EPSS probability is notable given there is no confirmed exploitation in CISA KEV and no known ransomware use yet.

Do this: Deploy the Microsoft patch to Windows 11 26H1 ARM64 and x64 hosts and any remaining Windows 10 1809 32-bit systems, prioritizing machines that process untrusted image files.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for CVE-2026-20846

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Patch this cycle
Not confirmed exploited yet, but the 30-day exploit probability is high (EPSS 25%).
Fixed by KB5075897 and 13 more (by build, listed below). Download from the Microsoft Update Catalog, or deploy via Windows Update, Intune, or WSUS.
Do this now: Patch in this maintenance window; do not let it slip to the next one.

Official patch(es) for CVE-2026-20846

Elevated priority: high severity or a meaningful exploitation probability, sooner if an affected product is internet-facing. In Intune or Defender, confirm whether the fixing updates KB5075897, KB5075899, KB5075904, KB5075906, KB5075912, KB5075941, KB5075942, KB5075943, KB5075970, KB5075971, KB5075999, KB5077179, KB5077181, KB5077212 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.

Apply the Microsoft security updates below to fix CVE-2026-20846. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.

KB5075897KB5075899KB5075904KB5075906KB5075912KB5075941KB5075942KB5075943KB5075970KB5075971KB5075999KB5077179KB5077181KB5077212

Scope and sources

Affected products
Fixed by the same updates
CVE-2026-21510CVE-2026-21513CVE-2026-21519CVE-2026-21533CVE-2026-21525CVE-2026-21255CVE-2026-21231CVE-2026-21232
Authoritative references
Official CVE record (cve.org)NVD detailMicrosoft MSRCFIRST.org EPSS

Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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