Vulnerability in Free5gc
CVE-2026-4531
A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Free5gc — versions 4.1.0
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/free5gc/free5gc/issues/792 (issue-tracking)
- github.com/free5gc/amf/pull/198 (issue-tracking, patch)
- github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799 (patch)
- github.com/free5gc/free5gc/ (product)
Frequently asked questions
- What is CVE-2026-4531?
- CVE-2026-4531 is a medium-severity vulnerability in Free5gc, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-03-22.
- How severe is CVE-2026-4531?
- Medium severity. CVSS v3 base score is 5.3 out of 10.