CVE-2026-69530: Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability
Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a 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
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33438Patch KB5122871 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5622Patch KB5122882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9245Patch KB5122876
Event History
Frequently Asked Questions
Which systems are listed as affected?
The affected software list includes Microsoft Windows Server 2025, Windows Server 2022, Windows Server 2019, Windows 10, and Microsoft Windows RMCAST (Reliable Multicast Transport Driver).
Does an attacker need credentials or user interaction to exploit this issue?
No privileges and no user interaction are indicated by the CVSS vector. The attack vector is network-based, although the attack complexity is rated high.