CVE tracker / CVE-2026-34336

CVE-2026-34336

CVE-2026-34336 is the Windows DWM Core Library 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
0.2%
EPSS: chance of exploitation in 30 days
High
Severity
Important
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.”

How to fix it

Microsoft lists 27 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 22, 2026

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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.