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.

CVSS Vector

Affected Products

References

• https://github.com/free5gc/free5gc/issues/920
• https://github.com/free5gc/free5gc/security/advisories/GHSA-jqfc-gwj5-3w63
• https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99
• https://github.com/free5gc/udr/pull/60
• https://github.com/free5gc/free5gc/issues/920
• https://github.com/free5gc/free5gc/security/advisories/GHSA-jqfc-gwj5-3w63