# CVE-2026-33192

## Summary

- **CVE ID:** CVE-2026-33192
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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 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 Products

- free5gc — free5gc (< 1.4.2)

## References

- [CNA](https://github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8)
- [CNA](https://github.com/free5gc/free5gc/issues/784)
- [CNA](https://github.com/free5gc/udm/pull/79)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 24.8

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