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High severity7.8NVD Advisory· Published Aug 11, 2026· Updated Aug 11, 2026

CVE-2026-66799

CVE-2026-66799

Description

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

Affected products

1

Microsoft/Windows Key Guardllm-fuzzy

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66799nvd

News mentions

1

Microsoft Patch Tuesday Update August 2026 – 394 Vulnerabilities Fixed, Including 3 Zero-Days
Cyber Security News · Aug 11, 2026