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.
- Score
- CVSS 3.1 8.8 High
- Status
- Deferred - security-advisories@github.com
- Published
- 2026-05-27
- Last modified
- 2026-10-26
- Weaknesses
- CWE-116, CWE-78
Affected products
References
- https://github.com/mcdope/pam_usb/security/advisories/GHSA-822m-whrh-vrj8
