CVE-2026-69530

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

State: Published
Severity: 8.1 High
Published: Sep 8, 2026
Updated: Oct 31, 2026
Reserved: Aug 3, 2026

Description

Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
Windows 10 Version 1809Microsoft	10.0.17763.0 to before 10.0.17763.9245Affected
Windows Server 2019Microsoft	10.0.17763.0 to before 10.0.17763.9245Affected
Windows Server 2019 (Server Core installation)Microsoft	10.0.17763.0 to before 10.0.17763.9245Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5622Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.33438Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.33438Affected

References

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerabilityvendor-advisorypatch

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