CVE-2026-44319

HighCVSS 7.5/10Last modified Oct 14, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-20CWE-617CWE-755

Affected software

VendorProductVersions
free5gcfree5gc< 4.2.2

References

Timeline

Published
May 27, 2026
Last modified
Oct 14, 2026
NVD status
Analyzed

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CVE-2026-44319: High severity, CVSS 7.5 | Vulnix