Medium 6.5Published May 27, 2026

CVE-2026-47273pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries

Updated under an hour ago (Oct 26, 2026, 6:40 AM ET)

Does this affect you?

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

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

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, pam_usb builds XPath expressions from user-supplied identifiers (PAM username, service name) and device-supplied identifiers (USB device serial, model, vendor) to query /etc/pamusb.conf. These identifiers were not validated for XPath metacharacters, allowing injection of arbitrary XPath predicates. This vulnerability is fixed in 0.9.0.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Weakness (CWE): CWE-91
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 28, 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

https://github.com/mcdope/pam_usb/security/advisories/GHSA-vfj3-5h5v-6g93x-refsource-confirm
https://github.com/mcdope/pam_usb/pull/311x-refsource-misc
https://github.com/mcdope/pam_usb/commit/721fed08a3596cb5b4671ad702f8fdc12dcc7420x-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.