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

CVE-2026-21219 has a CVSS 3.1 base score of 7.0 (High). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Windows Software Development Kit are affected by CVE-2026-21219?

Organizations using Use after free in Inbox COM Objects face moderate risk from CVE-2026-21219, a use-after-free vulnerability rated CVSS 7.0.. A patch is available.

How to fix or mitigate CVE-2026-21219?

Within 7 days: Identify all affected systems and apply vendor patches promptly. If patching is delayed, consider network segmentation to limit exposure.

Windows Software Development Kit CVE-2026-21219

HIGH

Use After Free (CWE-416)

2026-01-13 secure@microsoft.com

Use After Free Windows Software Development Kit

7.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.0 HIGH

AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 13, 2026 - 18:16 nvd

HIGH 7.0

DescriptionCVE.org

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

AnalysisAI

Use after free in Inbox COM Objects allows an unauthorized attacker to execute code locally. [CVSS 7.0 HIGH]

Technical ContextAI

Classified as CWE-416 (Use After Free). Affects Windows Software Development Kit. Use after free in Inbox COM Objects allows an unauthorized attacker to execute code locally.