CVE-2026-44319

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.

• CWE-20
• CWE-617
• CWE-755

• https://github.com/free5gc/free5gc/issues/924Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26prExploit, Vendor Advisory
• https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074Patch
• https://github.com/free5gc/nef/pull/25Issue Tracking, Patch
• https://github.com/free5gc/free5gc/issues/924Exploit, Issue Tracking
• https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26prExploit, Vendor Advisory

Published

May 27, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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