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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/issues/924	Exploit Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr	Exploit Vendor Advisory
https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074	Patch
https://github.com/free5gc/nef/pull/25	Issue Tracking Patch
https://github.com/free5gc/free5gc/issues/924	Exploit Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-27 17:16

Updated : 2026-06-17 10:50

NVD link : CVE-2026-44319

Mitre link : CVE-2026-44319

CVE.ORG link : CVE-2026-44319

JSON object : View

Products Affected

free5gc

free5gc

CWE

CWE-20

Improper Input Validation

CWE-617

Reachable Assertion

CWE-755

Improper Handling of Exceptional Conditions

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