CVE-2026-33065— free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscriptions request

free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscriptions request

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 DELETE requests with an empty supi path parameter. This leaks internal error handling behavior and makes it difficult for clients to distinguish between client-side errors and server-side failures. When a client sends a DELETE request with an empty supi (e.g., double slashes // in URL path), the UDM forwards the malformed request to UDR, which correctly returns 400. However, UDM propagates this as 500 SYSTEM_FAILURE instead of returning the appropriate 400 error to the client. This violates REST API best practices for DELETE operations. The issue has been patched in version 1.4.2.

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通过错误消息导致的信息暴露

free5GC 安全漏洞

free5GC是free5GC开源的一个第 5 代 (5G) 移动核心网络的开源项目。 free5GC 1.4.2之前版本存在安全漏洞，该漏洞源于UDM错误处理不当，将下游400错误转换为500错误，可能泄露内部错误处理行为。

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