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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.

PUBLISHED Reserved 2026-03-21 | Published 2026-03-22 | Updated 2026-03-23 | Assigner VulDB




MEDIUM: 6.9CVSS: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
MEDIUM: 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
MEDIUM: 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C
5.0AV:N/AC:L/Au:N/C:N/I:N/A:P/E:ND/RL:OF/RC:C

Problem types

Denial of Service

Timeline

2026-03-21:Advisory disclosed
2026-03-21:VulDB entry created
2026-03-21:VulDB entry last update

Credits

shovon0203 (VulDB User) reporter

References

github.com/free5gc/free5gc/issues/792 exploit

vuldb.com/?id.352319 (VDB-352319 | Free5GC AMF handler.go HandleRegistrationComplete denial of service) vdb-entry technical-description

vuldb.com/?ctiid.352319 (VDB-352319 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/?submit.774073 (Submit #774073 | Linux Foundation free5GC 4.1.0 Denial of Service) third-party-advisory

github.com/free5gc/free5gc/issues/792 issue-tracking

github.com/free5gc/amf/pull/198 issue-tracking patch

github.com/...ommit/52e9386401ce56ea773c5aa587d4cdf7d53da799 patch

github.com/free5gc/free5gc/ product

cve.org (CVE-2026-4531)

nvd.nist.gov (CVE-2026-4531)

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