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

Microsoft Windows · in CISA KEV since 2026-09-08

2026-09-08added to KEV

2026-09-22federal remediation due date

0.57%EPSS exploit probability (30 days) 46.1th percentile

7.8 HIGHCVSS 3.1

Unknownknown ransomware use

0days from NVD publication to KEV

What it is

Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.

Required action (CISA)

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.

CWE	CWE-122;CWE-908
CVSS vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
NVD published	2026-09-08 (Analyzed)

Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-85880.json · all KEV CVEs

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