CVE-2026-44319
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.
How to fix
- free5gc free5gc4.2.2 or later
- github.com/free5gc/nef1.2.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| free5gc free5gc | v < 4.2.2 | 4.2.2 |
| github.com/free5gc/nefGo | v < 1.2.3 | 1.2.3 |
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