VULNERABILITY INTELLIGENCE

CVE-2026-27643

CVSS score5.3 MEDIUM

EPSS probability0.31%

CISA KEVNot currently listed

Published2026-02-24

Last modified2026-06-17

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

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.

Weakness classification

security-advisories@github.com: CWE-209

Primary references

security-advisories@github.com — Exploit, Issue Tracking, Patch, Vendor Advisory
security-advisories@github.com — Patch, Vendor Advisory
security-advisories@github.com — Patch
security-advisories@github.com — Issue Tracking, Patch