CVE-2026-44319

HIGH EPSS 32.3%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
32.3% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 3

CWE-20 Improper Input Validation Validation
CWE-617
CWE-755

Affected Products 1

VendorProductVersionRange
free5gcfree5gc* <4.2.2

References 4

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

Remediation

  • github.com https://github.com/free5gc/nef/commit/f110517b1189801950b50668a593398687049074
    Patch
  • github.com https://github.com/free5gc/nef/pull/25
    Issue TrackingPatch