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Vulnerability record · CVE-2026-44329 · published 27 May 2026

CVE-2026-44329: Free5gc missing authentication for critical function vulnerability

Free5gc · Free5gc

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.

10.0 CVSS 3.1 Critical EPSS 0.56% · top 55.4% CWE-306 · Missing authentication for critical functionCWE-862 · Missing authorization
10.0CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/free5gc/free5gc/issues/887 ExploitIssue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3 ExploitVendor Advisory
https://github.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6e Patch
https://github.com/free5gc/smf/pull/197 Issue TrackingPatch
https://github.com/free5gc/free5gc/issues/887 ExploitIssue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3 ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-44329), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.