GDI+ Denial of Service Vulnerability

Buffer over-read in Windows GDI+ allows an unauthorized attacker to deny service over a network.

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7.5CVSS out of 10High severity

Scope

What the vendor says is affected

Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows Server 2025 (Server Core installation)
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows Server 2025
Windows 10 Version 1607 for 32-bit Systems

Versions the vendor lists as fixed

10.0.28000.1575
10.0.17763.8389
10.0.20348.4773
10.0.20348.4711
10.0.19044.6937
10.0.19045.6937
10.0.26100.32370
10.0.26100.32313
10.0.26200.7840
10.0.26200.7781
10.0.22631.6649
10.0.25398.2149
10.0.26100.7840
10.0.26100.7781
10.0.14393.8868
6.2.9200.25923
6.3.9600.23022
16.0.19822.20000

Next step

What the vendor recommends

Release Notes Install KB5077179. Install KB5075904. Install KB5075906. Install KB5075943. Install KB5075912. Install KB5075899. Install KB5075942. Install KB5077181. Install KB5077212. Install KB5075941. Install KB5075897. Install KB5075999. Install KB5075971. Install KB5075970.

Review the complete instructions on the vendor's site

Timeline

When this advisory changed

Feb 10, 2026 at 8:00 AM UTC
Published by Microsoft Security Response Center
The publication date reported by the vendor.
Jun 10, 2026 at 7:00 AM UTC
Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
Oct 3, 2026 at 1:00 PM UTC
Added to SecurityAlert
We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-20846View CVSS, KEV, EPSS, and threat context

Source

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Vendor: Microsoft Security Response Center
Advisory ID: CVE-2026-20846
Last source check: Oct 3, 2026 at 1:00 PM UTC

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What the vendor says is affected

Versions the vendor lists as fixed

What the vendor recommends

When this advisory changed

CVEs named in this advisory

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