CVE-2026-33192 | THREATINT

Description

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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-20 | Assigner GitHub_M

HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-209: Generation of Error Message Containing Sensitive Information

Product status

< 1.4.2

affected

References

github.com/...ree5gc/security/advisories/GHSA-5rvc-5cwx-g5x8

github.com/free5gc/free5gc/issues/784

github.com/free5gc/udm/pull/79

cve.org (CVE-2026-33192)

nvd.nist.gov (CVE-2026-33192)

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