CVE-2026-85880
Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-09-08. Federal due date: 2026-09-22.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Impact
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Windows Server 2016 | from 10.0.14393.0 before 10.0.14393.9512 |
| Microsoft | Windows Server 2012 | from 6.2.9200.0 before 6.2.9200.26349 |
| Microsoft | Windows Server 2012 (Server Core Installation) | from 6.2.9200.0 before 6.2.9200.26349 |
| Microsoft | Windows 10 Version 22H2 | from 10.0.19045.0 before 10.0.19045.7725 |
| Microsoft | Windows Server 2022 | from 10.0.20348.0 before 10.0.20348.5622 |
| Microsoft | Windows Server 2016 (Server Core Installation) | from 10.0.14393.0 before 10.0.14393.9512 |
| Microsoft | Windows Server 2019 (Server Core Installation) | from 10.0.17763.0 before 10.0.17763.9245 |
| Microsoft | Windows Server 2012 R2 | from 6.3.9600.0 before 6.3.9600.23398 |
| Microsoft | Windows 10 Version 21H2 | from 10.0.19044.0 before 10.0.19044.7725 |
| Microsoft | Windows Server 2019 | from 10.0.17763.0 before 10.0.17763.9245 |
| Microsoft | Windows Server 2012 R2 (Server Core Installation) | from 6.3.9600.0 before 6.3.9600.23398 |
| Microsoft | Windows 10 Version 1607 | from 10.0.14393.0 before 10.0.14393.9512 |
| Microsoft | Windows 10 1607 | before 10.0.14393.9512 |
| Microsoft | Windows 10 1809 | before 10.0.17763.9245 |
| Microsoft | Windows 10 21h2 | before 10.0.19044.7725 |
| Microsoft | Windows 10 22h2 | before 10.0.19045.7725 |
| Microsoft | Windows Server 2012 | All versions Version r2 |
| Microsoft | Windows Server 2016 | before 10.0.14393.9512 |
| Microsoft | Windows Server 2019 | before 10.0.17763.9245 |
| Microsoft | Windows Server 2022 | before 10.0.20348.5622 |