CVE-2026-44321

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.

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Produits concernés

• free5gc
• Free5gc free5gc

Scores CVSS

Faiblesses (CWE)

• CWE-306
• CWE-617
• CWE-862

Références

• https://github.com/free5gc/free5gc/issues/906 ExploitIssue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97 ExploitVendor Advisory
• https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5 Patch
• https://github.com/free5gc/smf/pull/203 Issue TrackingPatch
• https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97 ExploitVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories