Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Free5Gc | < 4.2.2 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/issues/924ExploitIssue Tracking
- https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26prExploitVendor Advisory
- https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074Patch
- https://github.com/free5gc/nef/pull/25Issue TrackingPatch
- https://github.com/free5gc/free5gc/issues/924ExploitIssue Tracking
- https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26prExploitVendor Advisory
FAQ
What is CVE-2026-44319?
CVE-2026-44319 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 PfdChangeNot...
How severe is CVE-2026-44319?
CVE-2026-44319 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44319?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Free5Gc.