Vulnerability 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 Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Free5Gc | < 4.2.2 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/issues/859ExploitIssue Tracking
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3p28-73q7-45xpExploitVendor Advisory
- https://github.com/free5gc/nef/pull/23Issue TrackingPatch
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3p28-73q7-45xpExploitVendor Advisory
FAQ
What is CVE-2026-44326?
CVE-2026-44326 is a vulnerability with a CVSS score of 9.4 (CRITICAL). 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 attack...
How severe is CVE-2026-44326?
CVE-2026-44326 has been rated CRITICAL with a CVSS base score of 9.4/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-44326?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Free5Gc.