{"cve":"CVE-2026-44319","nvd":{"published":"2026-05-27T17:16:37.033","modified":"2026-10-14T20:10:00.190","status":"Analyzed","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-20","CWE-617","CWE-755"],"references":["https://github.com/free5gc/free5gc/issues/924","https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr","https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074","https://github.com/free5gc/nef/pull/25","https://github.com/free5gc/free5gc/issues/924"],"products":["free5gc:free5gc"],"source":"nvd","synced_at":"2026-10-19T22:36:28.938604137+00:00"},"epss":{"cve":"CVE-2026-44319","score":0.00404,"percentile":0.34375,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-rxrq-fv76-26pr","url":"https://osv.dev/vulnerability/GHSA-rxrq-fv76-26pr","summary":"free5GC's NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri)","modified":"2026-06-25T23:11:12.482638940Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/nef","purl":"pkg:golang/github.com/free5gc/nef","ranges":["<1.2.3"],"fixed":["1.2.3"]}]},{"id":"GO-2026-5647","url":"https://osv.dev/vulnerability/GO-2026-5647","summary":"free5GC's NEF crashes via logger.Fatal on PFD notification delivery failure (attacker-controlled notifyUri) in github.com/free5gc/nef","modified":"2026-06-25T23:01:37.672847833Z","packages":[{"ecosystem":"Go","name":"github.com/free5gc/nef","purl":"pkg:golang/github.com/free5gc/nef","ranges":["<1.2.3"],"fixed":["1.2.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}