CVE-2026-103571
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Windows CNG Key Isolation Privilege Escalation
Vulnerability report for CVE-2026-103571, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-11-10
Last updated on: 2026-11-10
Assigner: Microsoft Corporation
Description
Description
An elevation of privilege vulnerability exists when the Windows Cryptography Next Generation (CNG) Key Isolation service improperly handles memory. An attacker who successfully exploited this vulnerability could run processes in an elevated context.
To exploit this vulnerability, an attacker would first have to gain execution on the victim system. An attacker could then run a specially crafted application to elevate privileges.
The security update addresses the vulnerability by correcting how the Windows CNG Key Isolation Service handles memory.
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | From 10.0.14393.0 (inc) to 10.0.14393.9688 (exc) |
| Microsoft | Windows 10 Version 1809 | From 10.0.17763.0 (inc) to 10.0.17763.9487 (exc) |
| Microsoft | Windows 10 Version 21H2 | From 10.0.19044.0 (inc) to 10.0.19044.7846 (exc) |
| Microsoft | Windows 10 Version 22H2 | From 10.0.19045.0 (inc) to 10.0.19045.7846 (exc) |
| Microsoft | Windows 11 version 23H2 | From 10.0.22631.0 (inc) to 10.0.22631.7711 (exc) |
| Microsoft | Windows 11 Version 23H2 | From 10.0.22631.0 (inc) to 10.0.22631.7711 (exc) |
| Microsoft | Windows 11 Version 24H2 | From 10.0.26100.0 (inc) to 10.0.26100.9974 (exc) |
| Microsoft | Windows 11 Version 25H2 | From 10.0.26200.0 (inc) to 10.0.26200.9974 (exc) |
| Microsoft | Windows 11 version 26H1 | From 10.0.28000.0 (inc) to 10.0.28000.3501 (exc) |
| Microsoft | Windows 11 Version 26H2 | From 10.0.26300.0 (inc) to 10.0.26300.9974 (exc) |
| Microsoft | Windows Server 2016 | From 10.0.14393.0 (inc) to 10.0.14393.9688 (exc) |
| Microsoft | Windows Server 2016 (Server Core installation) | From 10.0.14393.0 (inc) to 10.0.14393.9688 (exc) |
| Microsoft | Windows Server 2019 | From 10.0.17763.0 (inc) to 10.0.17763.9487 (exc) |
| Microsoft | Windows Server 2019 (Server Core installation) | From 10.0.17763.0 (inc) to 10.0.17763.9487 (exc) |
| Microsoft | Windows Server 2022 | From 10.0.20348.0 (inc) to 10.0.20348.5870 (exc) |
| Microsoft | Windows Server 2025 | From 10.0.26100.0 (inc) to 10.0.26100.33822 (exc) |
| Microsoft | Windows Server 2025 (Server Core installation) | From 10.0.26100.0 (inc) to 10.0.26100.33822 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-415 | The product calls free() twice on the same memory address. |
