CVE-2026-33192CWE-209

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

High · published March 20, 2026

CVSS v4.0
8.7
EPSS
0%
Percentile
34.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
8.7 · HIGH
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
EPSS
0.00416 · 34.9th percentile
Weakness
CWE-209 · Generation of Error Message Containing Sensitive Information
Published
2026-03-20T08:09Z
EPSS history
Timeline
  • 20 MAR 08:09Z
    free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques
    cvelistv5