# CVE-2026-20935: Windows Virtualization-Based Security (VBS) Information Disclosure Vulnerability

CVE-2026-20935 is fixed in 6 products on 1 platform, first by KB5073455, released January 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-20935
- Priority: Routine
- CVSS: 6.2 (Important)
- EPSS: 0.0044
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Jan 13, 2026
- Weakness: Untrusted Pointer Dereference
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20935

## Description

<p>Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an unauthorized attacker to disclose information locally.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 11 Version 23H2 for ARM64-based Systems | 22631.6491 | [KB5073455](https://patchblox.com/security/data/fix/microsoft/kb5073455.md) | Jan 13, 2026 |
| Microsoft | Windows 11 Version 23H2 for x64-based Systems | 22631.6491 | [KB5073455](https://patchblox.com/security/data/fix/microsoft/kb5073455.md) | Jan 13, 2026 |
| Microsoft | Windows 11 Version 24H2 for ARM64-based Systems |  | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 |
| Microsoft | Windows 11 Version 24H2 for x64-based Systems |  | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 |
| Microsoft | Windows 11 Version 25H2 for ARM64-based Systems |  | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 |
| Microsoft | Windows 11 Version 25H2 for x64-based Systems |  | [KB5074109](https://patchblox.com/security/data/fix/microsoft/kb5074109.md) | Jan 13, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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