Heap-based Buffer Overflow in Windows ALPC Affects Microsoft Products
CVE-2026-85880

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
8 September 2026

Badges

👾 Exploit Exists🦅 CISA Reported📰 News Worthy

What is CVE-2026-85880?

A heap-based buffer overflow exists in the Windows Advanced Local Procedure Call (ALPC) component, enabling an authorized attacker to exploit this vulnerability to elevate privileges on the affected system. By executing malicious code, the attacker could gain unauthorized access to sensitive system resources. It is essential for users to apply the necessary patches provided by Microsoft to mitigate this security risk effectively.

CISA has reported CVE-2026-85880

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-85880 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: 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.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.9512

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.9245

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7725

News Articles

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References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • đź“°

    First article discovered by theregister

  • đź‘ľ

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

.