CVE-2026-44321

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.

• CWE-306
• CWE-617
• CWE-862

• https://github.com/free5gc/free5gc/issues/906Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97Exploit, Vendor Advisory
• https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5Patch
• https://github.com/free5gc/smf/pull/203Issue Tracking, Patch
• https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97Exploit, Vendor Advisory

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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