Description
free5GC is an open-source project for 5th generation (5G) mobile core networks. Versions up to and including 1.4.1 of free5GC's AMF service have a Buffer Overflow vulnerability leading to Denial of Service. Remote unauthenticated attackers can crash the AMF service by sending a specially crafted NAS Registration Request with a malformed 5GS Mobile Identity, causing complete denial of service for the 5G core network. All deployments of free5GC using the AMF component may be affected. Pull request 43 of the free5gc/nas repo contains a fix. No direct workaround is available at the application level. Applying the official patch is recommended.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/free5gc/free5gc/security/advisories/GHSA-h6xc-8vvf-jcjp
Issue Tracking x_refsource_misc
https://github.com/free5gc/free5gc/issues/747
Issue Tracking x_refsource_misc
https://github.com/free5gc/nas/pull/43
Patch x_refsource_misc
https://github.com/free5gc/nas/commit/0329a7ac3f314f210366c1b3c33dc29eded4ac5f
Scores
CVSS v3
7.5
EPSS
0.0057
EPSS Percentile
42.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-129
Status
published
Products (1)
free5gc/amf
< 1.4.1
Published
Feb 23, 2026
Tracked Since
Feb 23, 2026