RCE in Mcdope Pam Usb
CVE-2026-44713
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.
Vulnerability class: Command Injection (OS Command Injection)
EPSS: 0.002 (5.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Mcdope Pam_usb — versions < 0.8.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
Frequently asked questions
- What is CVE-2026-44713?
- CVE-2026-44713 is a high-severity vulnerability in Mcdope Pam Usb, classified under OS Command Injection. CVSS score: 8.8/10. Published 2026-05-27.
- How severe is CVE-2026-44713?
- High severity. CVSS v3 base score is 8.8 out of 10.