CVE-2026-42459

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr	Exploit Mitigation Vendor Advisory
https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

History

14 Oct 2026, 20:10

Type	Values Removed	Values Added
Summary		(es) free5GC es una implementación de código abierto de la red central 5G. Antes de la versión 4.2.2, el componente UDM de free5GC no valida el parámetro de ruta supi en seis manejadores GET del servicio nudm-sdm (Gestión de Datos de Suscriptor). Un atacante no autenticado puede inyectar caracteres de control en el parámetro SUPI, haciendo que UDM reenvíe una solicitud malformada a UDR y devuelva una respuesta de error 500 Internal Server Error que expone detalles de la infraestructura interna. Esta vulnerabilidad está corregida en la versión 4.2.2.

Information

Published : 2026-05-27 17:16

Updated : 2026-10-14 20:10

NVD link : CVE-2026-42459

Mitre link : CVE-2026-42459

CVE.ORG link : CVE-2026-42459

JSON object : View

Products Affected

free5gc

free5gc

CWE

CWE-20

Improper Input Validation

CWE-209

Generation of Error Message Containing Sensitive Information

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