CVE-2026-85877: Windows Print Spooler Remote Code Execution Vulnerability

Overview

Severity

High (CVSS 8.8)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Category

Remote Code Execution

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Sep

Released

2026-09-08

Description

Heap-based buffer overflow in Windows Print Spooler Components allows an unauthorized attacker to execute code over a network.

FAQ

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? This vulnerability could be triggered when a user connects a Windows client to a malicious server.

Affected Products (1)

Windows

• Windows 11 Version 24H2 for x64-based Systems

Security Updates (1)

• 5124008

Acknowledgments

Thanatos Tian (HKPolyU) & npc0vo

Revision History

• 2026-09-08: Information published.