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CVE-2026-42082

free5GC: Missing Concurrent NAS SMC Validation During NGAP Handover

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List NVD
NVD MITRE
3.7CVSS
LOW

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:AAC:HPR:LUI:NS:UC:NI:LA:L
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low

Weaknesses

CWE-358

Affected Products

free5gc
free5gc

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-vrrx-58h3-prmh
github.com

Timeline

Published
May 27, 2026
Last Updated
May 27, 2026

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