CVE-2026-44329 | THREATINT

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.

PUBLISHED Reserved 2026-05-05 | Published 2026-05-27 | Updated 2026-05-28 | Assigner GitHub_M

CRITICAL: 10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H

Problem types

CWE-306: Missing Authentication for Critical Function

CWE-862: Missing Authorization

Product status

< 4.2.2

affected

References

github.com/...ree5gc/security/advisories/GHSA-3258-qmv8-frp3 exploit

github.com/free5gc/free5gc/issues/887 exploit

github.com/...ree5gc/security/advisories/GHSA-3258-qmv8-frp3

github.com/free5gc/free5gc/issues/887

github.com/free5gc/smf/pull/197

github.com/...ommit/e23ce97565f285eb99eed153743c62bf4c767c6e

cve.org (CVE-2026-44329)

nvd.nist.gov (CVE-2026-44329)

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