CVE-2026-44319: FREE5GC

High severity, CVSS 7.5. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• FREE5GC FREE5GC: before 4.2.2 (fixed in 4.2.2)

Published 2026-05-27. Last modified 2026-06-17.