What is CVE-2026-40248?

CVE-2026-40248 is a high-severity vulnerability in Free5gc, classified under Improper Authorization. CVSS score: 7.5/10. Published 2026-04-16.

How severe is CVE-2026-40248?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Free5gc

CVE-2026-40248

free5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the handler for creating or updating Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-t…

EPSS: 0.004 (34.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Free5gc — versions <= 1.4.2

Weakness classification (CWE)

CWE-285 — Improper Authorization
CWE-636

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-40248?: CVE-2026-40248 is a high-severity vulnerability in Free5gc, classified under Improper Authorization. CVSS score: 7.5/10. Published 2026-04-16.
How severe is CVE-2026-40248?: High severity. CVSS v3 base score is 7.5 out of 10.