CVE-2026-85821— Windows Universal Disk Format File System Driver (UDFS) Information Disclosure Vulnerability
Quick assessment
Affected
Microsoft Windows 10 Version 1607
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Windows通用磁盘格式文件系统驱动程序（UDFS）中存在越界读取漏洞，攻击者可利用该漏洞在本地披露信息（需具备授权权限）。 翻译说明： 1. 术语准确性：UDFS译为"通用磁盘格式文件系统驱动程序"符合微软技术文档标准 2. 漏洞类型：明确标注为"越界读取"（Out-of-bounds read） 3. 权限要求：通过"需具备授权权限"准确传达"authorized"的要求 4. 攻击范围：使用"本地披露"体现local attack vector的特性 5. 被动语态转换：将英文被动结构调整为中文主动表达更符
Possible ATT&CK Techniques 1 AI
T1005 · Data from Local SystemAffected Version Matrix 21
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0< 10.0.14393.9612 |
affected |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0< 10.0.17763.9376 |
affected |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0< 10.0.19044.7807 |
affected |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0< 10.0.19044.7807 |
affected |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0< 10.0.22631.7652 |
affected |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0< 10.0.22631.7652 |
affected |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0< 10.0.26100.9711 |
affected |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0< 10.0.26200.9711 |
affected |
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0< 10.0.28000.3231 |
affected |
| Microsoft | Windows 11 Version 26H2 | 10.0.26300.0< 10.0.26300.9711 |
affected |
| Microsoft | Windows Server 2012 | 6.2.9200.0< 6.2.9200.26434 |
affected |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0< 6.2.9200.26434 |
affected |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0< 6.3.9600.23470 |
affected |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0< 6.3.9600.23470 |
affected |
| Microsoft | Windows Server 2016 | 10.0.14393.0< 10.0.14393.9612 |
affected |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0< 10.0.14393.9612 |
affected |
| Microsoft | Windows Server 2019 | 10.0.17763.0< 10.0.17763.9376 |
affected |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0< 10.0.17763.9376 |
affected |
| Microsoft | Windows Server 2022 | 10.0.20348.0< 10.0.20348.5761 |
affected |
| Microsoft | Windows Server 2025 | 10.0.26100.0< 10.0.26100.33650 |
affected |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0< 10.0.26100.33650 |
affected |
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I. Basic Information for CVE-2026-85821
Vulnerability Information
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Vulnerability Title
Windows Universal Disk Format File System Driver (UDFS) Information Disclosure Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Out-of-bounds read in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to disclose information locally.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 ~ 10.0.14393.9612 | - |
|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 ~ 10.0.17763.9376 | - |
|
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 ~ 10.0.19044.7807 | - |
|
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 ~ 10.0.19044.7807 | - |
|
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 ~ 10.0.22631.7652 | - |
|
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 ~ 10.0.22631.7652 | - |
|
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 ~ 10.0.26100.9711 | - |
|
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 ~ 10.0.26200.9711 | - |
|
| Microsoft | Windows 11 version 26H1 | 10.0.28000.0 ~ 10.0.28000.3231 | - |
|
| Microsoft | Windows 11 Version 26H2 | 10.0.26300.0 ~ 10.0.26300.9711 | - |
|
| Microsoft | Windows Server 2012 | 6.2.9200.0 ~ 6.2.9200.26434 | - |
|
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 ~ 6.2.9200.26434 | - |
|
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 ~ 6.3.9600.23470 | - |
|
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 ~ 6.3.9600.23470 | - |
|
| Microsoft | Windows Server 2016 | 10.0.14393.0 ~ 10.0.14393.9612 | - |
|
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 ~ 10.0.14393.9612 | - |
|
| Microsoft | Windows Server 2019 | 10.0.17763.0 ~ 10.0.17763.9376 | - |
|
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 ~ 10.0.17763.9376 | - |
|
| Microsoft | Windows Server 2022 | 10.0.20348.0 ~ 10.0.20348.5761 | - |
|
| Microsoft | Windows Server 2025 | 10.0.26100.0 ~ 10.0.26100.33650 | - |
|
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 ~ 10.0.26100.33650 | - |
|
II. Public POCs for CVE-2026-85821
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-85821 (1)
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V. Comments for CVE-2026-85821
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