CVE-2026-85880
HighMicrosoft Windows Heap-Based Buffer Overflow Vulnerability
7.8 CVSS v3.1
- Published
- Sep 8, 2026
- Updated
- Sep 24, 2026
- Vendor
- Microsoft
- Affected versions
- See affected products
- Weakness
- CWE-122, CWE-908
Summary
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Severity
High (7.8)CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
- Microsoft Windows 10 1607 < 10.0.14393.9512
- Microsoft Windows 10 1809 < 10.0.17763.9245
- Microsoft Windows 10 21h2 < 10.0.19044.7725
- Microsoft Windows 10 22h2 < 10.0.19045.7725
- Microsoft Windows Server 2012
- Microsoft Windows Server 2012 r2
- Microsoft Windows Server 2016 < 10.0.14393.9512
- Microsoft Windows Server 2019 < 10.0.17763.9245
- Microsoft Windows Server 2022 < 10.0.20348.5622
Exploitation status
Actively exploited
Listed in the CISA Known Exploited Vulnerabilities catalog on Sep 8, 2026. Federal remediation due: Sep 22, 2026.
Technical details
Technical analysis has not been written for this record yet.
Mitigation & remediation
- 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.