CVE-2026-33192
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.
- Score
- CVSS 4.0 8.7 High
- Status
- Analyzed - security-advisories@github.com
- Published
- 2026-03-20
- Last modified
- 2026-03-20
- Weaknesses
- CWE-209
Affected products
References
- https://github.com/free5gc/free5gc/issues/784
- https://github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8
- https://github.com/free5gc/udm/pull/79
