Medium 6.3Published May 27, 2026

CVE-2026-47274pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation

Updated under an hour ago (Oct 26, 2026, 11:25 PM ET)

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It affects mcdope pam_usb. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for mcdope pam_usb

Exploited in the last 30 days

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, multiple pam_usb helper tools resolved external binaries through the PATH environment variable rather than using absolute paths. An attacker who can influence the process environment during PAM authentication or tool execution could substitute malicious binaries. The affected tools are pamusb-check (src/tmux.c), pamusb-conf (tools/pamusb-conf), and pamusb-keyring-unlock-gnome (tools/pamusb-keyring-unlock-gnome). This vulnerability is fixed in 0.9.0.

CVSS: 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-427
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mcdope pam_usb mcdope:pam_usb (from the name)	before 0.9.0	CNA record

References

References

https://github.com/mcdope/pam_usb/security/advisories/GHSA-pp29-w28g-r9h9	x-refsource-confirm
https://github.com/mcdope/pam_usb/commit/1ee8745920388df48d001a8e61ba629071557937	x-refsource-misc
https://github.com/mcdope/pam_usb/commit/52a1fd6413b7ffcc1a5b58ce432be42e7bf0dbd0	x-refsource-misc
https://github.com/mcdope/pam_usb/commit/993e73d8bebb1d8e62677388de3402b6ec36b600	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.