CVE-2026-44326

CRITICAL EPSS 22.8%
Published May 27, 20261mo ago · Modified Jun 17, 20262w ago
9.4 CVSS 3.1
Critical
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 mounts the 3gpp-traffic-influence API without inbound OAuth2/bearer-token authorization. A network attacker who can reach NEF on the SBI can create, read, patch, and delete traffic-influence subscriptions either with no Authorization header at all, or with a forged bearer token (e.g. Authorization: Bearer not-a-real-token). This includes creating AnyUeInd=true subscriptions intended to affect group / any-UE traffic steering. The route group is also reachable even when the running config's ServiceList does not declare it, so operators who think they disabled the service via config are still exposed. This vulnerability is fixed in 4.2.2.

CVSS Details

Base Score
9.4
Exploitability
3.9
Impact
5.5
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
22.8% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-862 Missing Authorization Authorization

Affected Products 1

VendorProductVersionRange
free5gcfree5gc* <4.2.2

References 3

  • github.com https://github.com/free5gc/free5gc/issues/859
    ExploitIssue Tracking
  • github.com https://github.com/free5gc/free5gc/security/advisories/GHSA-3p28-73q7-45xp
    ExploitVendor Advisory
  • github.com https://github.com/free5gc/nef/pull/23
    Issue TrackingPatch

Remediation

  • github.com https://github.com/free5gc/nef/pull/23
    Issue TrackingPatch