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CVE-2026-69789

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

Microsoft Windows 10 Version 1607Operating systems
Open in ThreatlineRecord JSON
CVSS
7.5High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.42%Chance of exploitation activity in the next 30 days, higher than 34% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in10.0.14393.9512Also 10.0.17763.9245, 10.0.19044.7725 and 9 moreCVE List
Published13 Oct 2026Updated 23 Oct 2026CVE List

What fixes it

  • 10.0.14393.9512Windows 10 Version 1607CVE List
  • 10.0.17763.9245Windows 10 Version 1809CVE List
  • 10.0.19044.7725Windows 10 Version 21H2CVE List
  • 10.0.19045.7725Windows 10 Version 22H2CVE List
  • 10.0.22631.7582Windows 11 version 23H2CVE List
  • 10.0.22631.7582Windows 11 Version 23H2CVE List
Show all 20 fixed versions
  • 10.0.26100.9445Windows 11 Version 24H2CVE List
  • 10.0.26200.9445Windows 11 Version 25H2CVE List
  • 10.0.28000.2954Windows 11 version 26H1CVE List
  • 6.2.9200.26349Windows Server 2012CVE List
  • 6.2.9200.26349Windows Server 2012 (Server Core installation)CVE List
  • 6.3.9600.23398Windows Server 2012 R2CVE List
  • 6.3.9600.23398Windows Server 2012 R2 (Server Core installation)CVE List
  • 10.0.14393.9512Windows Server 2016CVE List
  • 10.0.14393.9512Windows Server 2016 (Server Core installation)CVE List
  • 10.0.17763.9245Windows Server 2019CVE List
  • 10.0.17763.9245Windows Server 2019 (Server Core installation)CVE List
  • 10.0.20348.5622Windows Server 2022CVE List
  • 10.0.26100.33438Windows Server 2025CVE List
  • 10.0.26100.33438Windows Server 2025 (Server Core installation)CVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Vendor and government advisories 1

Vendors that say their products are affected, and agencies that issued alerts. Check each for the fixed release of the product you run.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

Description

Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

Text from CVE List

Affected versions 20

  • Windows 10 Version 1607affected: 10.0.14393.0 before 10.0.14393.9512CVE List
  • Windows 10 Version 1809affected: 10.0.17763.0 before 10.0.17763.9245CVE List
  • Windows 10 Version 21H2affected: 10.0.19044.0 before 10.0.19044.7725CVE List
  • Windows 10 Version 22H2affected: 10.0.19045.0 before 10.0.19045.7725CVE List
  • Windows 11 version 23H2affected: 10.0.22631.0 before 10.0.22631.7582CVE List
  • Windows 11 Version 23H2affected: 10.0.22631.0 before 10.0.22631.7582CVE List
  • Windows 11 Version 24H2affected: 10.0.26100.0 before 10.0.26100.9445CVE List
  • Windows 11 Version 25H2affected: 10.0.26200.0 before 10.0.26200.9445CVE List
  • Windows 11 version 26H1affected: 10.0.28000.0 before 10.0.28000.2954CVE List
  • Windows Server 2012affected: 6.2.9200.0 before 6.2.9200.26349CVE List
  • Windows Server 2012 (Server Core installation)affected: 6.2.9200.0 before 6.2.9200.26349CVE List
  • Windows Server 2012 R2affected: 6.3.9600.0 before 6.3.9600.23398CVE List
  • Windows Server 2012 R2 (Server Core installation)affected: 6.3.9600.0 before 6.3.9600.23398CVE List
  • Windows Server 2016affected: 10.0.14393.0 before 10.0.14393.9512CVE List
  • Windows Server 2016 (Server Core installation)affected: 10.0.14393.0 before 10.0.14393.9512CVE List
  • Windows Server 2019affected: 10.0.17763.0 before 10.0.17763.9245CVE List
  • Windows Server 2019 (Server Core installation)affected: 10.0.17763.0 before 10.0.17763.9245CVE List
  • Windows Server 2022affected: 10.0.20348.0 before 10.0.20348.5622CVE List
  • Windows Server 2025affected: 10.0.26100.0 before 10.0.26100.33438CVE List
  • Windows Server 2025 (Server Core installation)affected: 10.0.26100.0 before 10.0.26100.33438CVE List

References 1