CVE-2026-42082: Free5GC AMF has Missing Concurrent NAS SMC Validation During NGAP Handover

May 7, 2026

The AMF in Free5GC v4.2.1 does not enforce the concurrent security procedure rules defined in 3GPP TS 33.501 §6.9.5.1. The AMF does not check for ongoing N2 handover procedures before initiating a NAS Security Mode Command, and vice versa. This can lead to mismatches between NAS and AS security contexts in the network and the UE.

References

github.com/advisories/GHSA-vrrx-58h3-prmh
github.com/free5gc/amf/blame/v1.4.3/internal/gmm/sm.go
github.com/free5gc/amf/blame/v1.4.3/internal/ngap/handler.go
github.com/free5gc/free5gc
github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh
nvd.nist.gov/vuln/detail/CVE-2026-42082

Code Behaviors & Features

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