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cnvd-2026-37847

EUVD-2026-322453

fkie_cve-2026-44324

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.

GHSA-jqfc-gwj5-3w63 — free5GC's UDR nudr-dr DELETE amf-subscriptions panics on missing UE state via nil interface type assertion (single auth…

Affected: Go: github.com/free5gc/udr

### Summary 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 is the no-precondition sibling of free5gc/free5gc#919: same handler, same bug pattern (set `pd`, do not return, then dereference), but the panic site is the nil-interface type assertion at line 61 instead of the nil-pointer deref at line 69. No earlier EE-subscription create is required.

This endpoint requires a valid `nudr-dr` OAuth2 access token (PR:L, NOT PR:N), so this is scored as an authenticated panic-DoS, not as an unauth-bypass finding.

### Details Validated against the UDR container in the official Docker compose lab. - Source repo tag: `v4.2.1` - Running Docker image: `free5gc/udr:v4.2.1` - Runtime UDR commit: `754d23b0` - Docker validation date: 2026-03-22 - UDR endpoint: `http://10.100.200.11:8000`

Vulnerable handler (the `ok` miss path sets `pd` but…