CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability
Summary
Microsoft Windows contains a heap-based buffer overflow vulnerability in its Advanced Local Procedure Call component. Successful exploitation allows an attacker to gain local privilege escalation. CISA mandates applying mitigations per vendor instructions and adhering to their guidance on prioritizing security updates.
IFF Assessment
This vulnerability allows for local privilege escalation, which is a significant security risk for defenders.
Severity
CISA KEV: Listed as actively exploited. Federal patch due: September 22, 2026. Known ransomware use: Unknown.
Defender Context
This entry in CISA's Known Exploited Vulnerabilities (KEV) catalog highlights a critical vulnerability in Microsoft Windows that allows for local privilege escalation. Defenders must prioritize patching this vulnerability according to CISA's directives, especially given the potential for its exploitation to lead to further compromise.