CVE-2026-33064
Description
Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2 are vulnerable to procedure panic caused by Nil Pointer Dereference in the /sdm-subscriptions endpoint. A remote attacker can cause the UDM service to panic and crash by sending a crafted POST request to the /sdm-subscriptions endpoint with a malformed URL path containing path traversal sequences (../) and a large JSON payload. The DataChangeNotificationProcedure function in notifier.go attempts to access a nil pointer without proper validation, causing a complete service crash with "runtime error: invalid memory address or nil pointer dereference". Exploitation would result in UDM functionality disruption until recovery by restart. This issue has been fixed in version 1.4.2.
How to fix
- free5gc udm1.4.2 or later
- github.com/free5gc/udm1.4.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| free5gc udm | v < 1.4.2 | 1.4.2 |
| github.com/free5gc/udmGo | v < 1.4.2 | 1.4.2 |
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