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Vulnerability record · CVE-2026-44709 · published 27 May 2026

CVE-2026-44709: OS command injection vulnerability

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, pamusb-pinentry reads the PINENTRY_FALLBACK_APP environment variable and executes it directly without any validation. Any process that can set environment variables before pamusb-pinentry is invoked can point PINENTRY_FALLBACK_APP at an arbitrary binary or script and have it executed with the privileges of the pam_usb tool chain. This vulnerability is fixed in 0.8.7.

7.8 CVSS 3.1 High EPSS 0.21% · top 89.8% CWE-78 · OS command injection Deferred
7.8CVSS 3.1 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, pamusb-pinentry reads the PINENTRY_FALLBACK_APP environment variable and executes it directly without any validation. Any process that can set environment variables before pamusb-pinentry is invoked can point PINENTRY_FALLBACK_APP at an arbitrary binary or script and have it executed with the privileges of the pam_usb tool chain. This vulnerability is fixed in 0.8.7.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/mcdope/pam_usb/security/advisories/GHSA-jxrj-q67x-wr4c
https://github.com/mcdope/pam_usb/security/advisories/GHSA-jxrj-q67x-wr4c

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Source: NIST National Vulnerability Database (record CVE-2026-44709), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.