CVE-2026-44329
critical · 10free5GC 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.
10
CVSS
0.3%
EPSS (exploit prob.)
26th
EPSS percentile
2026-05-27
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
Weaknesses
CWE-306CWE-862
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| free5gc | free5gc | < 4.2.2 |
Check a specific version with /api/v1/cve/match.
References
- https://github.com/free5gc/free5gc/issues/887
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3
- https://github.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6e
- https://github.com/free5gc/smf/pull/197
- https://github.com/free5gc/free5gc/issues/887
- https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-44329