CVE-2026-20876 — Heap-based Buffer Overflow in Microsoft Windows 11 Version 22h3

CWE-122 — Heap-based Buffer Overflow5 documents5 sources
Severity
6.7MEDIUMNVD
EPSS
0.0%
top 88.57%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
9
Microsoft Windows 11 Version 22h3Microsoft Windows 11 Version 23h2Microsoft Windows 11 Version 24h2+6 more
Timeline
PublishedJan 13

Description

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

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HExploitability: 0.8 | Impact: 5.9

Affected Packages9 packages

▶NVDmicrosoft/windows< 10.0.25398.2092+1
▶NVDmicrosoft/windows_11_23h2< 10.0.22631.6491
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.7623
▶NVDmicrosoft/windows_11_25h2< 10.0.26200.7623
▶CVEListV5microsoft/windows_server_202510.0.26100.0 — 10.0.26100.32230

🔴Vulnerability Details

2
GHSA
GHSA-h5v7-c9m8-xw29: Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally↗2026-01-13
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CVEList
Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability↗2026-01-13
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📋Vendor Advisories

1
Microsoft
Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability↗2026-01-13
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-20876 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-20876 — Heap-based Buffer Overflow | cvebase