CVE-2026-42082
free5GC: Missing Concurrent NAS SMC Validation During NGAP Handover
Vexday Risk Score
8Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 3.7EPSS 0.3%KEV nãoPoC —Patch —
Lifecycle
May 27, 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC 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. This vulnerability is fixed in 4.2.2.
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L
Affected products
free5gc · free5gcWant to know if your infrastructure is exposed to this?
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