CVE-2026-44709

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 v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

25 Oct 2026, 23:10

Type	Values Removed	Values Added
Summary		(es) pam_usb proporciona autenticación de hardware para Linux utilizando medios extraíbles ordinarios. Antes de 0.8.7, pamusb-pinentry lee la variable de entorno PINENTRY_FALLBACK_APP y la ejecuta directamente sin ninguna validación. Cualquier proceso que pueda establecer variables de entorno antes de que se invoque pamusb-pinentry puede apuntar PINENTRY_FALLBACK_APP a un binario o script arbitrario y hacer que se ejecute con los privilegios de la cadena de herramientas de pam_usb. Esta vulnerabilidad está corregida en 0.8.7.

Information

Published : 2026-05-27 21:16

Updated : 2026-10-25 23:10

NVD link : CVE-2026-44709

Mitre link : CVE-2026-44709

CVE.ORG link : CVE-2026-44709

JSON object : View

Products Affected

No product.

CWE

CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

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