CVE-2026-47273

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (3)

Core 3

Scores

CVSS v3 6.5
EPSS 0.0027
EPSS Percentile 18.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-91
Status published
Products (1)
mcdope/pam_usb < 0.9.0
Published May 27, 2026
Tracked Since May 28, 2026