CVE-2026-42459

HIGH

free5GC: Improper Input Validation and Generation of Error Message Containing Sensitive Information in github.com/free5gc/udm

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 7.5
EPSS 0.0028
EPSS Percentile 19.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-20 CWE-209
Status published
Products (2)
free5gc/free5gc < 4.2.2 (2 CPE variants)
free5gc/udm 0 - 1.4.3Go
Published May 27, 2026
Tracked Since May 27, 2026