CVE-2026-85880
KEVMicrosoft Windows Heap-Based Buffer Overflow Vulnerability
Description
Microsoft Windows Advanced Local Procedure Call contains a heap-based buffer overflow vulnerability that allows an attacker to elevate privileges locally.
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
CVSS 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HPublishedSep 8, 2026
Last modifiedSep 24, 2026
Added to KEVSep 8, 2026
Remediation dueSep 22, 2026
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85880PatchVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-85880US Government Resource
0 recent articles mention this CVE
69
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 34 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 0.39% · top 67% of all CVEs
- Weakness
- CWE-122
Recommended actions
- 1.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.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.