Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Udr | <= 1.4.1 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/issues/753ExploitIssue TrackingPatch
- https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82Vendor AdvisoryPatch
- https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4Patch
- https://github.com/free5gc/udr/pull/56Issue TrackingPatch
FAQ
What is CVE-2026-27643?
CVE-2026-27643 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 lea...
How severe is CVE-2026-27643?
CVE-2026-27643 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27643?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Udr.