# CVE-2026-44319

## Summary

- **CVE ID:** CVE-2026-44319
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-20, CWE-617, CWE-755
- **Published:** May 27, 2026
- **Last Modified:** May 28, 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.

## Affected Products

- free5gc — free5gc (< 4.2.2)

## References

- [CNA](https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr)
- [CNA](https://github.com/free5gc/free5gc/issues/924)
- [CNA](https://github.com/free5gc/nef/pull/25)
- [CNA](https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 33.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._