CVE-2026-33192 HIGH

CVE-2026-33192: free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques

Vendor Free5Gc
Product free5gc
Weakness CWE-209 · Error message info leak
Published March 20, 2026
Last update March 20, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

What the vulnerability does

01Description

Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. In versions prior to 1.4.2, the UDM incorrectly converts a downstream 400 Bad Request (from UDR) into a 500 Internal Server Error when handling PATCH requests with an empty supi path parameter. Additionally, the UDM incorrectly translates the PATCH method to PUT when forwarding to UDR, indicating a deeper architectural issue. This leaks internal error handling behavior, making it difficult for clients to distinguish between client-side errors and server-side failures. The issue has been patched in version 1.4.2.

Key dates

02Disclosure timeline

March 20, 2026 CVE published
March 20, 2026 Record updated