Heap-based buffer overflow in Microsoft Windows - CVE-2026-85877
Published: September 9, 2026
Vulnerability identifier: #VU148353
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-85877
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in Windows Print Spooler Components when a user connects a Windows client to a malicious server. A remote attacker can cause the client to connect to a malicious server to execute arbitrary code.
User interaction is required.
Affected software
Microsoft Windows
How to mitigate CVE-2026-85877
Install security update from vendor's website.
Microsoft Windows - update to 11 24H2 10.0.26100.9445