CVE WatchSep 24, 2026

CVE-2026-85880

Microsoft Windows Heap-Based Buffer Overflow Vulnerability

CVSS

7.8

High

EPSS

3.6%

p89

KEV

YES

Sep 8, 2026

Exploit Today

0-100

Published: Sep 8, 2026 · Last modified: Sep 24, 2026 · CWE-122 · CWE-908

EPSS · 30d

3.6%EPSS · 30 days3.6%

2026-09-242026-10-23

KEV catalog record

Product

Microsoft / Windows

Vulnerability

Microsoft Windows Heap-Based Buffer Overflow Vulnerability

Added to KEV

Sep 8, 2026

Remediate by

Sep 22, 2026

Known ransomware use

Summary description

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.

Notes

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-85880 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-85880

Technical description

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

Official references

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