CVE-2026-85880

Published Sep 8, 2026

Last updated 23 days ago

Exploit known CVSS high 7.8

Windows

Zero-day

Server

Windows ALPC

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-85880 is identified as a heap-based buffer overflow vulnerability affecting the Windows Advanced Local Procedure Call (ALPC). This flaw enables an authorized attacker to locally elevate their privileges. Reports indicate that this vulnerability has been actively exploited in the wild as a zero-day. An attacker who can execute code in a low-privilege AppContainer could exploit this to escape the sandbox and achieve SYSTEM privileges on the affected system, requiring no additional user interaction.

Description: Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Source: secure@microsoft.com
NVD status: Analyzed
Products: windows_10_1607, windows_10_1809, windows_10_21h2, windows_10_22h2, windows_server_2012, windows_server_2016, windows_server_2019, windows_server_2022

Risk scores

CVSS 3.1

Type: Secondary
Base score: 7.8
Impact score: 5.9
Exploitability score: 1.8
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity: HIGH

Known exploits

Data from CISA

Vulnerability name: Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Exploit added on: Sep 8, 2026
Exploit action due: Sep 22, 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.

Weaknesses

secure@microsoft.com: CWE-122

Hype score: Not currently trending

Configurations

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]

References

Sources include official advisories and independent security research.