CVE-2026-44329

Name: CVE-2026-44329
Creator: NVD / NIST
Published: 2026-05-27T17:16:38.49+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 10/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2026-44329 is a critical-severity vulnerability rated 10/10 on the CVSS scale. 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

10/10

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

EPSS Probability

0.33%

24.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Free5gc	Free5gc	< 4.2.2

References

https://github.com/free5gc/free5gc/issues/887Exploit, Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3Exploit, Vendor Advisory
https://github.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6ePatch
https://github.com/free5gc/smf/pull/197Issue Tracking, Patch
https://github.com/free5gc/free5gc/issues/887Exploit, Issue Tracking
https://github.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3Exploit, Vendor Advisory

Timeline

Published: May 27, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-44329?

How severe is CVE-2026-44329?

CVE-2026-44329 has a CVSS score of 10/10 (CRITICAL severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2026-44329?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-44329?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST