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CVE-2026-33192

free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques

Published: Mar 20, 2026Updated: Mar 23, 2026 Sources: CVE List NVDCWE-209
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 76.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-209

Affected Products

free5gcfree5gc
On-premNetwork Device
Networking Infrastructure / router-switch
udmfree5gc
Mixed
Networking Infrastructure / network-management
free5gcoss-projectNetworking Infrastructureaka free5gc udm, free5gc smf, udm, smf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Discovery
View detailed technique mapping

References

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

Timeline

Published
Mar 20, 2026
Last Updated
Mar 23, 2026

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