CVE-2026-44326

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 v3 9.4 CRITICAL

9.4^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.5

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/issues/859	Exploit Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3p28-73q7-45xp	Exploit Vendor Advisory
https://github.com/free5gc/nef/pull/23	Issue Tracking Patch
https://github.com/free5gc/free5gc/security/advisories/GHSA-3p28-73q7-45xp	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:free5gc:free5gc:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-05-27 17:16

Updated : 2026-06-17 10:50

NVD link : CVE-2026-44326

Mitre link : CVE-2026-44326

CVE.ORG link : CVE-2026-44326

JSON object : View

Products Affected

free5gc

free5gc

CWE

CWE-862

Missing Authorization

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