{"id":"CVE-2026-44319","aliases":["GHSA-rxrq-fv76-26pr","GO-2026-5647"],"url":"https://o3.security/vulnerability/CVE-2026-44319","summary":"free5GC: NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri)","details":"free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's NEF terminates the entire process when a stored PFD-subscription notifyUri cannot be reached. In PfdChangeNotifier.FlushNotifications(), the notifier calls NnefPFDmanagementNotify(...) and on any delivery error invokes logger.PFDManageLog.Fatal(err), which is os.Exit(1)-equivalent in Go. An attacker who can create a PFD subscription with an attacker-chosen notifyUri and then trigger a PFD change can deterministically kill NEF on the asynchronous delivery attempt -- the process exits with status 1, dropping NEF's entire SBI surface until restart. This vulnerability is fixed in 4.2.2.","published":"2026-05-27T15:49:20.934Z","modified":"2026-08-07T11:51:10.757013031Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/free5gc/nef","fixedVersion":"1.2.3"}],"fix":{"url":"https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074","label":"free5gc/nef@f110517"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44319.json"},{"type":"ADVISORY","url":"https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44319"},{"type":"REPORT","url":"https://github.com/free5gc/free5gc/issues/924"},{"type":"FIX","url":"https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074"},{"type":"FIX","url":"https://github.com/free5gc/nef/pull/25"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:51:10.757013031Z"}}