What is CVE-2026-40343?

CVE-2026-40343 is a medium-severity vulnerability in Free5gc, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.8/10. Published 2026-04-22.

How severe is CVE-2026-40343?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Vulnerability in Free5gc

CVE-2026-40343

free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.2, a fail-open request handling flaw in the UDR service causes the `/nud…

EPSS: 0.100 (95.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Free5gc
Free5gc Udr — versions <= 1.4.2

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

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

Frequently asked questions

What is CVE-2026-40343?: CVE-2026-40343 is a medium-severity vulnerability in Free5gc, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 5.8/10. Published 2026-04-22.
How severe is CVE-2026-40343?: Medium severity. CVSS v3 base score is 5.8 out of 10.