CVE-2026-62816: Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability
Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.
Other sources
Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
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Fixed in 10.0.14393.9418Patch KB5120418 - Upgrade
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Fixed in 10.0.28000.2704Patch KB5121000 - Upgrade
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Fixed in 10.0.17763.9115Patch KB5120238 - Upgrade
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Fixed in 10.0.26100.9168Fixed in 10.0.26000.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.26100.33296Fixed in 10.0.26100.33222Patch KB5120228 - Upgrade
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Fixed in 10.0.22631.7517Patch KB5120240 - Upgrade
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Fixed in 10.0.26200.9168Fixed in 10.0.26100.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.19045.7663Patch KB5120249 - Upgrade
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Fixed in 10.0.26100.9168Fixed in 10.0.26100.9106Patch KB5120994 - Upgrade
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Fixed in 10.0.19044.7663Patch KB5120249 - Upgrade
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Fixed in 6.3.9600.23337Patch KB5120386 - Upgrade
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Fixed in 10.0.20348.5499Fixed in 10.0.20348.5440Patch KB5120229 - Upgrade
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Fixed in 6.2.9200.26279Patch KB5120385
Event History
Frequently Asked Questions
What is the severity of CVE-2026-62816?
CVE-2026-62816 has a severity rating of high, with a score of 8.8.
What does CVE-2026-62816 affect?
CVE-2026-62816 affects Microsoft Windows 10, Windows 11, and multiple versions of Windows Server.
How does CVE-2026-62816 allow attackers to exploit the system?
CVE-2026-62816 allows unauthorized attackers to execute code via a heap-based buffer overflow in the Reliable Multicast Transport Driver.
How do I fix CVE-2026-62816?
To mitigate CVE-2026-62816, install the latest Microsoft updates that address this vulnerability.
What type of vulnerability is CVE-2026-62816?
CVE-2026-62816 is classified as a remote code execution vulnerability due to a heap-based buffer overflow.