Known exploited vulnerability · Microsoft

CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability

highCVSS 3.1 7.8Exploited

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

Published Sep 8, 2026 · Updated Sep 24, 2026

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.

Advisory details

From the National Vulnerability Database. This product uses the NVD API but is not endorsed or certified by the NVD.

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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