CVE-2026-69426: CWE-122: Heap-based Buffer Overflow in Microsoft Windows 10 Version 1607

This vulnerability (CVE-2026-69426) involves a heap-based buffer overflow in the Windows VOLSNAP.SYS component. It affects various builds of Windows 10, including Version 1607 and later builds up to certain update versions. An authorized attacker with local access can exploit this flaw to execute arbitrary code, potentially leading to full system compromise. The vulnerability has been assigned a CVSS v3.1 base score of 7.8, indicating high severity. Microsoft has released an official fix to address this issue.

Successful exploitation allows an authorized local attacker to execute arbitrary code with elevated privileges, potentially leading to complete system compromise. The vulnerability affects 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.

An official fix is available from Microsoft. Users and administrators should apply the security updates provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69426. No additional mitigation actions are specified or required beyond applying the official patch.