CVE-2026-44713

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed inside double-quotes without sanitisation, any value containing " terminates the quoted string and injects arbitrary shell syntax. popen() runs as root inside the PAM stack. This vulnerability is fixed in 0.8.7.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.0 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/mcdope/pam_usb/security/advisories/GHSA-822m-whrh-vrj8

Configurations

No configuration.

History

26 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) pam_usb proporciona autenticación de hardware para Linux utilizando medios extraíbles comunes. Antes de 0.8.7, src/tmux.c lee la variable de entorno $TMUX del usuario, la divide por comas e interpola el componente de la ruta del socket directamente en un comando de shell pasado a popen(). Debido a que el valor se coloca dentro de comillas dobles sin saneamiento, cualquier valor que contenga ” termina la cadena entre comillas e inyecta sintaxis de shell arbitraria. popen() se ejecuta como root dentro de la pila PAM. Esta vulnerabilidad se corrige en 0.8.7.

Information

Published : 2026-05-27 21:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-44713

Mitre link : CVE-2026-44713

CVE.ORG link : CVE-2026-44713

JSON object : View

Products Affected

No product.

CWE

CWE-78

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

CWE-116

Improper Encoding or Escaping of Output

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