🛡️ CVE-2026-42459
🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-20 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-20
Public Exploit ⚠️ Yes
Source NVD
Published 2026-05-27
Updated 2026-06-09
Modified 2026-05-28
Fix URL N/A

Affected Packages

Software From version Fixed in
free5gc — 4.2.2
github.com/free5gc/udm — —
unknown — —

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