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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-33065)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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.
    (CVE-2026-33065)

ID	Name	Product	Family	Severity
303460	Linux Distros Unpatched Vulnerability : CVE-2026-33065	Nessus	Misc.	medium
438984	SCA: security update for github.com/free5gc/udm (GHSA-958m-gxmc-mccm)	Tenable Cloud Security	SCA Checks	medium
438984	SCA: security update for github.com/free5gc/udm (GHSA-958m-gxmc-mccm)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

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CVE-2026-33065

medium

Tenable Plugins

medium

medium

medium