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.

PUBLISHED Reserved 2026-05-05 | Published 2026-05-27 | Updated 2026-05-28 | Assigner GitHub_M

Problem types

CWE-704: Incorrect Type Conversion or Cast

CWE-754: Improper Check for Unusual or Exceptional Conditions

Product status

References

github.com/...ree5gc/security/advisories/GHSA-jqfc-gwj5-3w63 exploit

github.com/free5gc/free5gc/issues/920 exploit

github.com/...ree5gc/security/advisories/GHSA-jqfc-gwj5-3w63

github.com/free5gc/free5gc/issues/920

github.com/free5gc/udr/pull/60

github.com/...ommit/8a1d3c63be99d378806d771f086ff32f1867da99

cve.org (CVE-2026-44324)

nvd.nist.gov (CVE-2026-44324)

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