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CVE-2026-42081

free5GC: UE Security Capability bypass on NGAP PathSwitchRequest

Published: May 27, 2026Updated: May 29, 2026 Sources: CVE List NVDCWE-358
6.1MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 81.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not verify the UE Security Capabilities received in NGAP PathSwitchRequest messages against its locally stored values, as mandated by 3GPP TS 33.501 §6.7.3.1. A malicious gNB can overwrite the AMF's stored UE security capabilities with arbitrary values, which are then propagated in PathSwitchRequest Acknowledge messages and subsequent Handover Request messages. This leads to persistent handover denial-of-service for affected UEs. This vulnerability is fixed in 4.2.2.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:CC:NI:LA:L
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-358

Affected Products

free5gc
oss-projectaka free5gc udm, smf, free5gc smf, udm
free5gcOn-premNetwork Device
Networking Infrastructure / router-switch

Exploitability

Official Patch Available

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-77x9-rf64-92gv
github.com

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