# CVE-2026-4531

## Summary

- **CVE ID:** CVE-2026-4531
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X)
- **CWE:** CWE-404
- **Published:** Mar 22, 2026
- **Last Modified:** Mar 23, 2026

## Description

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.

## Affected Products

- n/a — Free5GC (4.1.0)

## References

- [CNA](https://vuldb.com/?id.352319)
- [CNA](https://vuldb.com/?ctiid.352319)
- [CNA](https://vuldb.com/?submit.774073)
- [CNA](https://github.com/free5gc/free5gc/issues/792)
- [CNA](https://github.com/free5gc/amf/pull/198)
- [CNA](https://github.com/free5gc/amf/commit/52e9386401ce56ea773c5aa587d4cdf7d53da799)
- [CNA](https://github.com/free5gc/free5gc/)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._