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CVE-2026-69530

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

Published: Sep 8, 2026Updated: Sep 9, 2026 Sources: CVE List NVDCWE-416
8.1HIGH
NVD MITRE
EPSS Score
0.6%
Top 55.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
OpenVAS

Description

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

In plain language

AI Act now

This Windows remote code execution flaw can let an attacker run code from the network in certain RMCAST (Reliable Multicast Transport Driver) situations, so most small businesses running Windows 10 or Windows Server should act quickly to install the fixed updates.

Executive summary

CVE-2026-69530 is a remote code execution vulnerability caused by a use-after-free condition in the Windows Reliable Multicast Transport Driver (RMCAST); an attacker can trigger it over the network without user interaction, leading to potential system compromise.

If affected, business impact
Full computer takeoverMalware installationRansomware riskService disruption

What to do now

  1. Check which Windows versions you run (Windows 10, Windows Server 2019/2022/2025) and review your patch history for RMCAST/security updates.
  2. For Windows 10 and Windows Server 2019, update to at least 10.0.17763.9245.
  3. For Windows Server 2022, update to at least 10.0.20348.5622.
  4. For Windows Server 2025, update to at least 10.0.26100.33438.
  5. After updating, confirm the update shows as installed in Windows Update / your server update reporting tool.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-416

Affected Products

Microsoft
commercial·US
Windows 10 Version 1809On-premOS
Operating Systems / windows
Windows Server 2019 (Server Core installation)On-premOS
Operating Systems / windows
Windows Server 2022On-premOS
Operating Systems / windows
Windows Server 2025 (Server Core installation)On-premOS
Operating Systems / windows
and 2 more affected products View all →

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
Is your org exposed to CVE-2026-69530?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69530
msrc.microsoft.com
News mentions
3

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