CVE-2026-33192

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/20/2026

Last Modified3/23/2026

Sourcenvd

Honeypot Sightings0

Affected Products

free5gc:udm

Weaknesses (CWE)

CWE-209

References

https://github.com/free5gc/free5gc/issues/784(security-advisories@github.com)

https://github.com/free5gc/free5gc/security/advisories/GHSA-5rvc-5cwx-g5x8(security-advisories@github.com)

https://github.com/free5gc/udm/pull/79(security-advisories@github.com)

IOC Correlations

No correlations recorded

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