CVE-2026-40409

highCVSS 7.8covered by 1 sourcefirst seen 2026-06-09

CSIRTS triage

What: An elevation of privilege vulnerability exists in the UDFS driver.
Who is affected: Users of Windows with the UDFS driver.
Urgency: Remediation is high urgency due to the high severity of the vulnerability.
Action: Install the latest security update for the UDFS driver.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch CVE-2026-40409

Get an email if CVE-2026-40409 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Low exploitation risk0.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-40409 status](https://www.csirts.com/badge/CVE-2026-40409)](https://www.csirts.com/cve/CVE-2026-40409)