# CVE-2026-33065

## Summary

- **CVE ID:** CVE-2026-33065
- **Severity:** MEDIUM
- **CVSS Score:** 6.9 (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)
- **CWE:** CWE-209
- **Published:** Mar 20, 2026
- **Last Modified:** Mar 20, 2026

## 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 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.

## Affected Products

- free5gc — free5gc (< 1.4.2)

## References

- [CNA](https://github.com/free5gc/free5gc/security/advisories/GHSA-958m-gxmc-mccm)
- [CNA](https://github.com/free5gc/free5gc/issues/783)
- [CNA](https://github.com/free5gc/udm/pull/79)
- [CNA](https://github.com/free5gc/udm/commit/88de9fa74a1b3f3522e53b4cfa2d184712ffa4ee)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.28%
- **EPSS Percentile:** 20.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._