Description
free5GC is an open-source project for 5th generation (5G) mobile core networks. Versions up to and including 1.4.1 of the User Data Repository are affected by Improper Error Handling with Information Exposure. The NEF component reliably leaks internal parsing error details (e.g., invalid character 'n' after top-level value) to remote clients, which can aid attackers in service fingerprinting. All deployments of free5GC using the Nnef_PfdManagement service may be vulnerable. free5gc/udr pull request 56 contains a patch. 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-cj2h-x8qm-xgwc
Issue Tracking x_refsource_misc
https://github.com/free5gc/free5gc/issues/753
Issue Tracking x_refsource_misc
https://github.com/free5gc/udr/pull/56
Patch x_refsource_misc
https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4
Scores
CVSS v3
5.3
EPSS
0.0035
EPSS Percentile
26.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-209
Status
published
Products (1)
free5gc/udr
< 1.4.1
Published
Feb 24, 2026
Tracked Since
Feb 24, 2026