HIGH Published October 13, 2026

CVE-2026-85858

Out-of-bounds read in Windows Win32 Kernel Subsystem allows an authorized attacker to elevate privileges locally.

CVSS base score

7.8 (v3.1)

Severity

HIGH

Attack vector

Local

Weakness

CWE-125

Last modified

October 29, 2026

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

microsoft windows 11 23h2 microsoft windows 11 24h2 microsoft windows 11 25h2 microsoft windows 11 26h1 microsoft windows 11 26h2 microsoft windows server 2022 microsoft windows server 2025

References

msrc.microsoft.com Patch, Vendor Advisory

View full NVD advisory →

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CVE-2026-85858

Affected products

References

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