#VU121258 Use-after-free in Windows SDK - CVE-2026-21219

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Main Vulnerability Database Vulnerabilities #VU121258

#VU121258 Use-after-free in Windows SDK - CVE-2026-21219

Published: January 13, 2026


Vulnerability identifier: #VU121258
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-21219
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
Windows SDK
Software vendor:
Microsoft

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in Inbox COM Objects (Global Memory). A remote attacker can win a race condition and execute arbitrary code on the target system.


Remediation

Install updates from vendor's website.

External links