CVE-2026-44709: Mcdope Pam USB

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, pamusb-pinentry reads the PINENTRY_FALLBACK_APP environment variable and executes it directly without any validation. Any process that can set environment variables before pamusb-pinentry is invoked can point PINENTRY_FALLBACK_APP at an arbitrary binary or script and have it executed with the privileges of the pam_usb tool chain. This vulnerability is fixed in 0.8.7.

Affected products

• Mcdope Pam USB: before 0.8.7 (fixed in 0.8.7)

Published 2026-05-27. Last modified 2026-06-17.