free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/free5gc/udmGo | < 1.4.2 | 1.4.2 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- github.com/advisories/GHSA-5rvc-5cwx-g5x8ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33192ghsaADVISORY
- github.com/free5gc/free5gc/issues/784ghsax_refsource_MISCWEB
- github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8ghsax_refsource_CONFIRMWEB
- github.com/free5gc/udm/pull/79ghsax_refsource_MISCWEB
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