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Vulnerability record · CVE-2026-44713 · published 27 May 2026

CVE-2026-44713: OS command injection vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.21% · top 89.8% CWE-78 · OS command injectionCWE-116 · CWE-116 Deferred
8.8CVSS 3.1 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://github.com/mcdope/pam_usb/security/advisories/GHSA-822m-whrh-vrj8

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Source: NIST National Vulnerability Database (record CVE-2026-44713), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.