CVE-2026-33192 — free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques
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 Re…
Published: 2026-03-20 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7