CVE tracker / CVE-2026-35420

CVE-2026-35420

CVE-2026-35420 is the Windows Kernel Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.8. It is not in CISA's Known Exploited Vulnerabilities catalog. Published May 12, 2026.

Risk summary

HighElevation of Privilege
7.8
CVSS v3 base
0.3%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.”

How to fix it

Microsoft lists 13 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-122: Heap-based Buffer Overflow
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
May 12, 2026
Last revised
May 12, 2026

Get told when this changes

Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.

Join Senserva Watch

References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.