CVE-2026-44713: Mcdope Pam USB

High severity, CVSS 8.8. 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, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed inside double-quotes without sanitisation, any value containing " terminates the quoted string and injects arbitrary shell syntax. popen() runs as root inside the PAM stack. 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.