Auth bypass in Free5gc

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…

Vulnerability class: Broken Authentication

EPSS: 0.001 (18.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-44329?
CVE-2026-44329 is a critical-severity vulnerability in Free5gc, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2026-05-27.
How severe is CVE-2026-44329?
Critical severity. CVSS v3 base score is 10.0 out of 10.