CVE-2026-70583: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
CVE-2026-70583 is a heap-based buffer overflow vulnerability in Windows Core Messaging on Microsoft Windows 10 Version 1607 and later versions. It allows an authorized local attacker to elevate privileges. The vulnerability has a high severity rating with a CVSS score of 7.8. Microsoft has released official fixes for affected versions.
CVSS v3.1
Score 7.8high
Affected software
Microsoft
Windows 10 Version 1607
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 2016
Microsoft
Windows Server 2016 (Server Core installation)
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-2026-70583) involves a heap-based buffer overflow in the Windows Core Messaging component of Microsoft Windows 10 Version 1607 and later. An authorized local attacker can exploit this flaw to elevate privileges on the affected system. The vulnerability is rated high severity with a CVSS 3.1 score of 7.8, reflecting its potential impact on confidentiality, integrity, and availability. Multiple specific Windows 10 builds are affected, with patches available and officially released by Microsoft.
Potential Impact
Successful exploitation allows an authorized local attacker to elevate privileges, potentially gaining higher-level access to the system. This can compromise system confidentiality, integrity, and availability as indicated by the CVSS vector (C:H/I:H/A:H). There are no known exploits in the wild at this time.
Mitigation Recommendations
Microsoft has released official fixes for all affected versions of Windows 10 listed. Users and administrators should apply these security updates promptly to remediate the vulnerability. Since an official fix is available, no additional mitigation actions are required beyond patching.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-04T19:47:18.931Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70583","vendor":"Microsoft"}]
Threat ID: 6aa0453dacd9273b49fa9be1
Added to database: 09/08/2026, 17:26:21 UTC
Last enriched: 10/16/2026, 21:42:10 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 24
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