CVE-2026-85880
Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Published Sep 8, 2026 · updated Sep 24, 2026 · Microsoft Windows
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Timeline
Detection, updates, and resolution for this record.
Sep 8, 2026 · Catalog
Detected
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Sep 8, 2026 · CISA KEV
Known exploited
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
Sep 22, 2026 · CISA KEV
Remediation due
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
Sep 24, 2026 · Catalog
Updated
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Required action
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.
CISA due date Sep 22, 2026
Affected
- cpe microsoft/windows 10 1607version unspecified
- cpe microsoft/windows 10 1809version unspecified
- cpe microsoft/windows 10 21h2version unspecified
- cpe microsoft/windows 10 22h2version unspecified
- vendor Microsoft Windowsversion unspecified
Sources
- CISA KEVCVE-2026-85880
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
cisa.gov - CVE.orgCVE-2026-85880
Official CVE identifier
cve.org - FIRST EPSSCVE-2026-85880
30-day exploitation probability 3.6%
first.org - NIST NVDCVE-2026-85880
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
nvd.nist.gov