CVE-2026-44329

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 v3 10.0 CRITICAL

10.0^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://github.com/free5gc/free5gc/issues/887	Exploit Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3	Exploit Vendor Advisory
https://github.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6e	Patch
https://github.com/free5gc/smf/pull/197	Issue Tracking Patch
https://github.com/free5gc/free5gc/issues/887	Exploit Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3	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-2026-44329

Mitre link : CVE-2026-44329

CVE.ORG link : CVE-2026-44329

JSON object : View

Products Affected

free5gc

free5gc

CWE

CWE-306

Missing Authentication for Critical Function

CWE-862

Missing Authorization

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