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Description

Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.

PUBLISHED Reserved 2025-12-03 | Published 2026-01-13 | Updated 2026-02-22 | Assigner microsoft




MEDIUM: 6.7CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-122: Heap-based Buffer Overflow

Product status

10.0.22631.0 (custom) before 10.0.22631.6491
affected

10.0.22631.0 (custom) before 10.0.22631.6491
affected

10.0.26100.0 (custom) before 10.0.26100.7623
affected

10.0.26200.0 (custom) before 10.0.26200.7623
affected

10.0.25398.0 (custom) before 10.0.25398.2092
affected

10.0.26100.0 (custom) before 10.0.26100.32230
affected

10.0.26100.0 (custom) before 10.0.26100.32230
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20876 (Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-20876)

nvd.nist.gov (CVE-2026-20876)

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