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Vulnerability · Published May 12, 2026 · Assigned by microsoft

CVE-2026-35420Windows Kernel Elevation of Privilege Vulnerability

High 7.8

In plain English

A high-severity heap buffer overflow in Windows Server 2012 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities).

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 74.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected products (as reported)

VendorProductVersions
Microsoft Windows Server 2012 6.2.9200.0 – before 6.2.9200.26079
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 – before 6.2.9200.26079
Microsoft Windows Server 2012 R2 6.3.9600.0 – before 6.3.9600.23181
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 – before 6.3.9600.23181
Microsoft Windows Server 2016 10.0.14393.0 – before 10.0.14393.9140
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 – before 10.0.14393.9140
Microsoft Windows Server 2019 10.0.17763.0 – before 10.0.17763.8755
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 – before 10.0.17763.8755
Microsoft Windows Server 2022 10.0.20348.0 – before 10.0.20348.5139
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 – before 10.0.25398.2330
Microsoft Windows Server 2025 10.0.26100.0 – before 10.0.26100.32860
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 – before 10.0.26100.32860

Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

References