Vulnerability Description
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without OAuth2/bearer-token authorization middleware. A network attacker who can reach SMF on the SBI can hit UPI endpoints with no Authorization header at all, and the requests reach the SMF business handlers. In the running Docker lab this was directly demonstrated for read (GET /upi/v1/upNodesLinks), write (POST /upi/v1/upNodesLinks with attacker-controlled UP-node and link payload), and delete (DELETE /upi/v1/upNodesLinks/{nodeID}) operations. 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/887ExploitIssue Tracking
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3ExploitVendor Advisory
- https://github.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6ePatch
- https://github.com/free5gc/smf/pull/197Issue TrackingPatch
- https://github.com/free5gc/free5gc/issues/887ExploitIssue Tracking
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3ExploitVendor Advisory
FAQ
What is CVE-2026-44329?
CVE-2026-44329 is a vulnerability with a CVSS score of 10.0 (CRITICAL). free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, free5GC's SMF mounts the UPI management route group without OAuth2/bearer-token authorization middleware. A network att...
How severe is CVE-2026-44329?
CVE-2026-44329 has been rated CRITICAL with a CVSS base score of 10.0/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-44329?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Free5Gc.