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HIGH · 7.8

CVE-2026-35420

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Vulnerability Description

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVSS Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows Server 2012-
MicrosoftWindows Server 2016< 10.0.14393.9140
MicrosoftWindows Server 2019< 10.0.17763.8755
MicrosoftWindows Server 2022< 10.0.20348.5074
MicrosoftWindows Server 2022 23H2< 10.0.25398.2330
MicrosoftWindows Server 2025< 10.0.26100.32772

Related Weaknesses (CWE)

CWE-122

References

FAQ

What is CVE-2026-35420?

CVE-2026-35420 is a vulnerability with a CVSS score of 7.8 (HIGH). Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

How severe is CVE-2026-35420?

CVE-2026-35420 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-35420?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23H2.