{"id":"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.","aliases":["GHSA-rxrq-fv76-26pr","GO-2026-5647"],"modified":"2026-08-12T03:51:40.264522511Z","published":"2026-05-27T15:49:20.934Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-20","CWE-617","CWE-755"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44319.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/free5gc/free5gc","events":[{"introduced":"0"},{"fixed":"8b0f4445fc931638fb624463ce3572a203517679"}],"database_specific":{"cpe":"cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"4.2.2"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}},{"type":"GIT","repo":"https://github.com/free5gc/nef","events":[{"introduced":"0"},{"fixed":"f110517b1189801950b50668a593398687049074"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v4.2.1","v4.2.0","v4.1.0","v4.0.1","v4.0.0","v3.4.5","v3.4.4","v3.4.3","v3.4.2","v3.4.1","v3.4.0","v3.3.0","v3.2.1","v3.2.0","v3.1.1","v3.1.0","v3.0.7","v3.0.6","v3.0.5","v1.2.2","v1.2.1","v1.2.0","v1.1.0","v1.0.2","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44319.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}