Auth bypass in Free5gc
CVE-2026-42083
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, PCF Npcf_SMPolicyControl missing authentication middleware allows unauthenticated access to SM policy handlers and disclosure of subscriber SUPI. In NewServer…
Vulnerability class: Broken Access Control
EPSS: 0.001 (28.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Free5gc — versions < 4.2.2
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Issue Tracking, Vendor Advisory)
- security-advisories@github.com (Exploit, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-42083?
- CVE-2026-42083 is a high-severity vulnerability in Free5gc, classified under Missing Authorization. CVSS score: 8.2/10. Published 2026-05-27.
- How severe is CVE-2026-42083?
- High severity. CVSS v3 base score is 8.2 out of 10.