What is CVE-2026-47272?

CVE-2026-47272 is a high-severity vulnerability in Mcdope Pam Usb, classified under Improper Authentication. CVSS score: 7.1/10. Published 2026-05-27.

How severe is CVE-2026-47272?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Mcdope Pam Usb

CVE-2026-47272

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusb_pad_compare() function in src/pad.c only verified that the user-side pad (~/.pamusb/device.pad) could be read, but did not enforce that the system-side pad (the pad file on the USB device) was also present and readable. If the user-side pad was deleted or unreadable, the function returned a failure that was treated as non-fatal in certain code paths, allowing authentication to succeed without the USB device being verified. A local user can delete their own ~/.pamusb/device.pad to remove the USB device requirement and authenticate without the physical device. This vulnerability is fixed in 0.9.0.

Vulnerability class: Broken Authentication

EPSS: 0.001 (1.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Mcdope Pam_usb — versions < 0.9.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-47272?: CVE-2026-47272 is a high-severity vulnerability in Mcdope Pam Usb, classified under Improper Authentication. CVSS score: 7.1/10. Published 2026-05-27.
How severe is CVE-2026-47272?: High severity. CVSS v3 base score is 7.1 out of 10.