What is CVE-2026-21219?

CVE-2026-21219 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Inbox COM Objects (Global Memory) Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-21219 cover?

CVE-2026-21219 covers the following CVE IDs: CVE-2026-21219. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21219?

CVE-2026-21219 has a CVSS v3 base score of 7.0, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21219?

CVE-2026-21219 affects 1 product, including: Windows SDK.

CVE-2026-21219HighCVSS 7.0

Inbox COM Objects (Global Memory) Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21219 →

📋 Description

Use after free in Inbox COM Objects allows an unauthorized attacker to execute code locally.

🎯 Affected products1

Windows SDK

✅ Remediation

KBRelease Notes (Security Update) — fixed build 10.0.26100.7463

🔗 References (3)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21219
patchhttps://learn.microsoft.com/en-us/windows/apps/windows-sdk/downloads
referencehttps://learn.microsoft.com/en-us/windows/apps/windows-sdk/release-notes