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

28 May 2026, 18:35

Type	Values Removed	Values Added
First Time		Free5gc free5gc Free5gc
CPE		cpe:2.3:a:free5gc:free5gc::::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.5
References	~~() https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr -~~	() https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr - Exploit, Mitigation, Vendor Advisory

28 May 2026, 16:16

Type	Values Removed	Values Added
References	~~() https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr -~~	() https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr -

27 May 2026, 17:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-27 17:16

Updated : 2026-05-28 18:35

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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