{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-44321", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-05-05T19:00:06.022Z", "datePublished": "2026-05-27T15:47:33.112Z", "dateUpdated": "2026-05-27T17:53:42.800Z"}, "containers": {"cna": {"title": "free5GC: SMF UPI POST /upi/v1/upNodesLinks exits the SMF process on overlapping UE pools (unauthenticated, reachable Fatalf)", "problemTypes": [{"descriptions": [{"cweId": "CWE-306", "lang": "en", "description": "CWE-306: Missing Authentication for Critical Function", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-617", "lang": "en", "description": "CWE-617: Reachable Assertion", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-862", "lang": "en", "description": "CWE-862: Missing Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97"}, {"name": "https://github.com/free5gc/free5gc/issues/906", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/free5gc/issues/906"}, {"name": "https://github.com/free5gc/smf/pull/203", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/smf/pull/203"}, {"name": "https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5", "tags": ["x_refsource_MISC"], "url": "https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5"}], "affected": [{"vendor": "free5gc", "product": "free5gc", "versions": [{"version": "< 4.2.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-05-27T15:47:33.112Z"}, "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."}], "source": {"advisory": "GHSA-44qj-cghf-9p97", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-27T17:53:25.117261Z", "id": "CVE-2026-44321", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-27T17:53:42.800Z"}}]}}

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