CVE-2026-47273 json
pam_usb: XPath injection via PAM-supplied identifiers in pam_usb configuration queries
published 2026-05-27 5 mo ago modified 2026-10-26 13 d ago also EUVD-2026-32652
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 19%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/mcdope/pam_usb@721fed0 commit
- github.com/mcdope/pam_usb#311 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N |
Affected products
- mcdope pam_usb
Classification
- Weakness
-
- CWE-91 XML Injection
References
Sources
- CVE List CVE-2026-47273
- NVD CVE-2026-47273
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