CVE-2026-70586: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607
Description
CVE-2026-70586 is a heap-based buffer overflow vulnerability in Windows Paint affecting multiple Windows 10 versions. 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.
CVSS v3.1
Score 8.8high
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 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
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-2026-70586) involves a heap-based buffer overflow in the Windows Paint application on Windows 10 Version 1607 and other specified builds. An attacker can exploit this flaw remotely without privileges and with low attack complexity, potentially leading to full system compromise including confidentiality, integrity, and availability impacts. The vulnerability is confirmed and published with a CVSS 3.1 base score of 8.8, indicating high severity. Official patches have been released by Microsoft to remediate the issue.
Potential Impact
Successful exploitation allows remote code execution by an unauthorized attacker, resulting in complete compromise of the affected system's confidentiality, integrity, and availability. This can lead to arbitrary code execution, potentially allowing installation of malware, data theft, or system disruption.
Mitigation Recommendations
Microsoft has released official fixes for this vulnerability. It is strongly recommended to apply the security updates provided by Microsoft for the affected Windows 10 versions to remediate this issue. No additional mitigation actions are indicated by the vendor advisory.
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-2026-70586","vendor":"Microsoft"}]
Threat ID: 6aa0453eacd9273b49fa9c05
Added to database: 09/08/2026, 17:26:22 UTC
Last enriched: 10/16/2026, 21:42:29 UTC
Last updated: 10/23/2026, 15:10:14 UTC
Views: 31
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