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CVE-2026-27643

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/24/2026

Last Modified2/25/2026

Sourcenvd

Honeypot Sightings0

Affected Products

free5gc:udr

Weaknesses (CWE)

CWE-209

References

https://github.com/free5gc/free5gc/issues/753(security-advisories@github.com)

https://github.com/free5gc/free5gc/security/advisories/GHSA-6468-f87j-6g82(security-advisories@github.com)

https://github.com/free5gc/udr/commit/754d23b03755ad59077ed529ce3b971e477080c4(security-advisories@github.com)

https://github.com/free5gc/udr/pull/56(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.