CVE-2026-47274

MEDIUM 6.3

pam_usb: Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

6th

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.

CWE	CWE-427
Vendor	mcdope
Product	pam_usb
Published	May 27, 2026
Last Updated	May 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

mcdope / pam_usb

< 0.9.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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