{"id":"CVE-2026-44321","sourceIdentifier":"security-advisories@github.com","published":"2026-05-27T17:16:37.330","lastModified":"2026-10-14T20:10:00.190","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"free5GC es una implementación de código abierto de la red central 5G. Antes de la versión 4.2.2, el SMF de free5GC monta el grupo de rutas de gestión de UPI sin middleware OAuth2 entrante. El gestor POST /upi/v1/upNodesLinks create-or-update acepta JSON controlado por el atacante y lo pasa directamente a UpNodesFromConfiguration(), que llama a logger.InitLog.Fatalf(...) en varios fallos de validación. Una ruta confirmada es la comprobación de superposición de grupos de IP de UE: un único POST no autenticado que añade un nuevo UPF cuyo grupo se superpone a un UPF existente termina todo el proceso SMF (docker ps muestra Exited (1)), no solo la goroutine. Esta vulnerabilidad está corregida en la versión 4.2.2."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"free5gc","product":"free5gc","versions":[{"version":"< 4.2.2","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-27T17:53:25.117261Z","id":"CVE-2026-44321","options":[{"exploitation":"poc"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-306"},{"lang":"en","value":"CWE-617"},{"lang":"en","value":"CWE-862"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*","versionEndExcluding":"4.2.2","matchCriteriaId":"EF7EBB95-EB4E-44C5-BF0A-9C99B0A7775F"}]}]}],"references":[{"url":"https://github.com/free5gc/free5gc/issues/906","source":"security-advisories@github.com","tags":["Exploit","Issue Tracking"]},{"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97","source":"security-advisories@github.com","tags":["Exploit","Vendor Advisory"]},{"url":"https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/free5gc/smf/pull/203","source":"security-advisories@github.com","tags":["Issue Tracking","Patch"]},{"url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Vendor Advisory"]}]}