---
cve: "CVE-2026-44319"
severity: "HIGH"
cvss: 7.5
epss: "40%"
vendor: "Free5Gc"
kev: false
exploited: false
published: "2026-05-27 17:16:37"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T10:05:11+02:00"
---

# CVE-2026-44319

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 8b0f4445fc931638fb624463ce3572a203517679 (Commit)
- f110517b1189801950b50668a593398687049074 (Commit)

## Referenzen

- <https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr>
- <https://github.com/free5gc/free5gc/issues/924>
- <https://github.com/free5gc/nef/pull/25>
- <https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-44319) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_