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Vulnerability record · CVE-2026-44319 · published 27 May 2026

CVE-2026-44319: Free5gc improper input validation vulnerability

Free5gc · Free5gc

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.

7.5 CVSS 3.1 High EPSS 0.66% · top 50.7% CWE-20 · Improper input validationCWE-617 · CWE-617
7.5CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/free5gc/free5gc/issues/924 ExploitIssue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr ExploitVendor Advisory
https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074 Patch
https://github.com/free5gc/nef/pull/25 Issue TrackingPatch
https://github.com/free5gc/free5gc/issues/924 ExploitIssue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-rxrq-fv76-26pr ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-44319), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.