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CVE-2026-44329

10.0 · CRITICAL

free5GC is an open-source implementation of the 5G core network.

Published May 27, 2026CWE-306EPSS 0.56%

Overview

CVE-2026-44329 is a critical-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/free5gc/free5gc/issues/887GitHubgithub.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3GitHubgithub.com/free5gc/smf/commit/e23ce97565f285eb99eed153743c62bf4c767c6eGitHubgithub.com/free5gc/smf/pull/197GitHubgithub.com/free5gc/free5gc/issues/887GitHubgithub.com/free5gc/free5gc/security/advisories/GHSA-3258-qmv8-frp3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-44329?

CVE-2026-44329 is a critical-severity vulnerability. It was published on May 27, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-44329?

This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-44329?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-44329?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-44329 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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