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medium threat

free5GC SMF Unauthenticated Process-Kill Denial-of-Service via UPI Endpoint

free5GC's SMF is vulnerable to an unauthenticated denial-of-service attack where a crafted POST request to the `/upi/v1/upNodesLinks` endpoint can trigger a `Fatalf` call, terminating the entire SMF process, effectively disrupting network services.

SMF free5GC DoS unauthenticated UPI CVE-2026-44321
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