CVE-2026-47273

Description

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.

PUBLISHED Reserved 2026-05-18 | Published 2026-05-27 | Updated 2026-05-28 | Assigner GitHub_M

Problem types

CWE-91: XML Injection (aka Blind XPath Injection)

Product status

References

github.com/...am_usb/security/advisories/GHSA-vfj3-5h5v-6g93

github.com/mcdope/pam_usb/pull/311

github.com/...ommit/721fed08a3596cb5b4671ad702f8fdc12dcc7420

cve.org (CVE-2026-47273)

nvd.nist.gov (CVE-2026-47273)

Download JSON