CVE-2026-69386: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1809
Description
CVE-2026-69386 is a heap-based buffer overflow vulnerability in Microsoft Windows Media Foundation affecting Windows 10 Version 1809 and later builds. This flaw allows an unauthorized attacker to execute code remotely over a network. The vulnerability has a high severity with a CVSS score of 8.8. Microsoft has released official fixes addressing this issue in multiple Windows 10 builds.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
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-2026-69386) involves a heap-based buffer overflow in the Windows Media Foundation component of Microsoft Windows 10 Version 1809 and subsequent builds. An attacker can exploit this flaw remotely to execute arbitrary code without privileges, requiring only user interaction. The vulnerability impacts confidentiality, integrity, and availability, as indicated by the CVSS vector. Official patches have been released by Microsoft to remediate this issue.
Potential Impact
Successful exploitation allows remote code execution by an unauthorized attacker, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. The vulnerability requires user interaction but no privileges or prior authentication. There are no known exploits in the wild at this time.
Mitigation Recommendations
Microsoft has released official fixes for this vulnerability. Users and administrators should apply the security updates provided by Microsoft for the affected Windows 10 versions to remediate this issue. No additional mitigation steps are required beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-03T20:54:04.487Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69386","vendor":"Microsoft"}]
Threat ID: 6aa044efacd9273b49fa7f30
Added to database: 09/08/2026, 17:25:03 UTC
Last enriched: 10/16/2026, 21:08:29 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 19
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