Description
free5GC UDR is the user data repository (UDR) for free5GC, an an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, 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 affected. free5gc/udr pull request 56 contains a patch for the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch.
References (4)
Core 4
Core References
Vendor Advisory x_refsource_confirm
https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82
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
0.0027
EPSS Percentile
19.0%
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