What is CVE-2026-85880?
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Timeline
- 2026-09-08Published to the U.S. National Vulnerability Database (NVD)
- 2026-09-08Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-09-09First covered in a defend.network daily briefing
- 2026-09-22CISA federal remediation deadline (BOD 22-01)
- 2026-09-24NVD record last updated
CISA Known Exploited Vulnerability
Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Affected product
Microsoft Windows
NVD also lists CPE entries for: Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows Server 2012
Remediation Steps
- Apply the vendor security update for Microsoft Windows as a priority.
- Restrict network exposure of the affected service to trusted sources until patched.
- Review logs and detections for indicators of exploitation.
- Confirm fixed versions against the official vendor advisory before deploying.
References
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
- Microsoft, Fortra vulnerabilities patched; Warlock escalates SharePoint attacks on critical infrastructure (2026-10-04)
- Microsoft’s record patch batch; fake LastPass installer deploys kernel EDR killer (2026-09-22)
- Microsoft patches 974 CVEs; Check Point RCE; Docker Sandboxes escape on macOS (2026-09-18)
- Cisco FMC actively exploited; BlueMoon exploit kit chains Chrome & Windows; AI tokens bypass MFA (2026-09-10)
- Microsoft patches record 974 CVEs; AI agents steal thousands of credentials; F5 devices breached (2026-09-09)
Related vulnerabilities
- CVE-2026-96951 – Microsoft Windows (same product)
- CVE-2026-69829 – Microsoft Windows 10 1607 (same product)
- CVE-2026-68820 – Microsoft Windows Ancillary Function Driver For WinSock (same product)
- CVE-2026-33824 – Microsoft Internet Key Exchange (IKE) Service Extensions (same product)
- CVE-2026-69730 – Microsoft Windows 10 1607 (same product)
- CVE-2026-56155 – Microsoft Active Directory Federation Services (same product)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.