Advisory severityHigh8.8Vendor: CriticalMicrosoft Server

High [CVE-2026-62816] Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-62816 affecting Windows Server 2019, Windows Server 2022, Windows Server 2025.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-62816 Source published Aug 11, 2026Source updated Aug 11, 2026

VulniPulse record published Aug 11, 2026Record updated Aug 16, 2026

CVE-2026-62816

Affected products & platforms

Microsoft ServerWindows Server

Open source advisory

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Summary

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016; and 2 more.

Affected products named by the advisory: Windows Server 2012 R2.

Affected versions

Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9418
Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9115
Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7663
Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7663
Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7517
Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7517
Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9168
Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9168
Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2704
Windows Server 2012 6.2.9200.0 before 6.2.9200.26279
Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.26279
Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23337

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

KB5120238 (build 10.0.17763.9121)
KB5120242 (build 10.0.20348.5499)
KB5120229 (build 10.0.20348.5440)
KB5120249 (build 10.0.19045.7663)
KB5120233 (build 10.0.26100.33296)
KB5120228 (build 10.0.26100.33222)
KB5121003 (build 10.0.26100.9168)
KB5120994 (build 10.0.26100.9106)

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Install the applicable security update for your platform: KB5120238, KB5120242, KB5120229, KB5120249, KB5120233, KB5120228 (see the Microsoft Update Catalog).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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