CVE-2026-44324
Description
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's UDR nudr-dr DELETE /subscription-data/{ueId}/{servingPlmnId}/ee-subscriptions/{subsId}/amf-subscriptions handler panics on a single authenticated request against a fresh UDR instance when the supplied ueId does not exist in UESubsCollection. The processor checks value, ok := udrSelf.UESubsCollection.Load(ueId) and sets a 404 USER_NOT_FOUND problem-details on the miss path, but execution continues and immediately runs value.(*udr_context.UESubsData) -- a Go type assertion on a nil interface, which panics with interface conversion: interface {} is nil, not *context.UESubsData. Gin recovery converts the panic into HTTP 500, but the endpoint remains repeatedly panicable. This vulnerability is fixed in 4.2.2.
How to fix
- free5gc free5gc4.2.2 or later
- github.com/free5gc/udr1.4.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| free5gc free5gc | v < 4.2.2 | 4.2.2 |
| github.com/free5gc/udrGo | v < 1.4.3 | 1.4.3 |
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