{"id":"CVE-2026-44321","revision":"6c284afd605f4b4fbb513fb5c31780a7","records":[{"revision":"6c284afd605f4b4fbb513fb5c31780a7","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-44321","aliases":[],"title":"free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)","description":"free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without inbound OAuth2 middleware. The POST /upi/v1/upNodesLinks create-or-update handler accepts attacker-controlled JSON and passes it directly into UpNodesFromConfiguration(), which calls logger.InitLog.Fatalf(...) on several validation failures. One confirmed path is the UE-IP-pool overlap check: a single unauthenticated POST that adds a new UPF whose pool overlaps an existing UPF terminates the entire SMF process (docker ps shows Exited (1)), not just the goroutine. This vulnerability is fixed in 4.2.2.","state":0,"publishedAt":"2026-05-27T15:47:33.112+00:00","modifiedAt":"2026-05-27T17:53:42.8+00:00","affected":[{"ecosystem":"Vendor product","name":"free5gc","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"free5gc\",\n                    \"product\": \"free5gc\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.2.2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97","https://github.com/free5gc/free5gc/issues/906","https://github.com/free5gc/smf/pull/203","https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-44321","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-44321","identifiers":["CVE-2026-44321"]},"retained":false,"historicalAffected":[]}],"coverage":[]}