{"cve":"CVE-2026-44321","nvd":{"published":"2026-05-27T17:16:37.330","modified":"2026-10-14T20:10:00.190","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-306","CWE-617","CWE-862"],"references":["https://github.com/free5gc/free5gc/issues/906","https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97","https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5","https://github.com/free5gc/smf/pull/203","https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97"],"products":["free5gc:free5gc"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-44321","score":0.00364,"percentile":0.29975,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-44qj-cghf-9p97","url":"https://osv.dev/vulnerability/GHSA-44qj-cghf-9p97","summary":"free5GC's SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)","modified":"2026-06-25T18:56:29.739801640Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/smf","purl":"pkg:golang/github.com/free5gc/smf","ranges":["<=1.4.3"],"fixed":[]}]},{"id":"GO-2026-5109","url":"https://osv.dev/vulnerability/GO-2026-5109","summary":"free5GC's SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf) in github.com/free5gc/smf","modified":"2026-06-25T18:45:20.993574805Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/smf","purl":"pkg:golang/github.com/free5gc/smf","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}