CVE-2026-44321

{"id": "CVE-2026-44321", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2026-05-27T17:16:37.330", "references": [{"url": "https://github.com/free5gc/free5gc/issues/906", "tags": ["Exploit", "Issue Tracking"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/smf/commit/e0974e07ddab44a67d36a563cca383b2449e33e5", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/smf/pull/203", "tags": ["Issue Tracking", "Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-44qj-cghf-9p97", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-306"}, {"lang": "en", "value": "CWE-617"}, {"lang": "en", "value": "CWE-862"}]}], "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."}], "lastModified": "2026-05-28T18:01:21.610", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "EF7EBB95-EB4E-44C5-BF0A-9C99B0A7775F", "versionEndExcluding": "4.2.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}