CVE-2026-78450: CWE-416: Use After Free in Microsoft Windows 10 Version 1809
Description
Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.
CVSS v3.1
Score 8.1high
Affected software
Microsoft
Windows 10 Version 1809
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-78450) involves a use-after-free condition in the Reliable Multicast Transport Driver (RMCAST) component of Microsoft Windows 10 Version 1809. Exploitation could allow an unauthenticated attacker to execute arbitrary code remotely over a network. The issue affects multiple specific build ranges of Windows 10 Version 1809. Microsoft has published an official fix to address this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could result in remote code execution with high impact on confidentiality, integrity, and availability of the affected system. The attacker does not require privileges or user interaction, but the attack complexity is high. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft for the affected Windows 10 Version 1809 builds as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78450.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-24T16:21:50.286Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78450","vendor":"Microsoft"}]
Threat ID: 6aa0455facd9273b49faa13d
Added to database: 09/08/2026, 17:26:55 UTC
Last enriched: 10/14/2026, 22:00:30 UTC
Last updated: 10/23/2026, 15:10:15 UTC
Views: 28
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