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CVE-2026-33065 PUBLISHED CVSS 6.900000095367432 MEDIUM

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.

EPSS 0.02% · 6.4th percentile

Risk Scores

CVSS v4.0
6.900000095367432
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS Score
0.02%
6.4th percentile

Affected Products

VendorProductVersions
github.comfree5gc/udm0, 0
free5gcfree5gc< 1.4.2, < 1.4.2
free5gcudm0, 0

Timeline

References

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