CVE-2026-20418: Google Matter

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

In Thread, there is a possible out of bounds write due to a missing bounds check. This could lead to remote escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: WCNCR00465153; Issue ID: MSV-4927.

Affected products

• Google Matter: up to and including 1.4

Published 2026-02-02. Last modified 2026-06-17.