{"id":"CVE-2026-44324","aliases":["GHSA-jqfc-gwj5-3w63","GO-2026-5478"],"url":"https://o3.security/vulnerability/CVE-2026-44324","summary":"free5GC: UDR nudr-dr DELETE amf-subscriptions panics on missing UE state via nil interface type assertion (single authenticated request)","details":"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":"2026-05-27T15:44:27.616Z","modified":"2026-08-07T11:51:10.391216603Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/free5gc/udr","fixedVersion":"1.4.3"}],"fix":{"url":"https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99","label":"free5gc/udr@8a1d3c6"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44324.json"},{"type":"ADVISORY","url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-jqfc-gwj5-3w63"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44324"},{"type":"REPORT","url":"https://github.com/free5gc/free5gc/issues/920"},{"type":"FIX","url":"https://github.com/free5gc/udr/commit/8a1d3c63be99d378806d771f086ff32f1867da99"},{"type":"FIX","url":"https://github.com/free5gc/udr/pull/60"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:10.391216603Z"}}