CVE-2026-42459
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductFree5gc
PublishedMay 27, 2026
First seenMay 27, 2026
Weakness typeCWE-20Improper input validationCWE-209CWE-209
How to fix
Update
- free5gc free5gc4.2.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| free5gc free5gc | v < 4.2.2 | 4.2.2 |
| github.com/free5gc/udmGo | v ≤ 1.4.3, No range specified | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.