Invalid Request Handling in Free5GC UDM Component by Linux Foundation
CVE-2026-33065

6.9MEDIUM

Key Information:

Vendor

Free5gc

Status
Free5gc
Vendor
CVE Published:
20 March 2026

What is CVE-2026-33065?

The Free5GC's UDM component in versions prior to 1.4.2 mishandles DELETE requests with an empty 'supi' path parameter by incorrectly converting a 400 Bad Request from UDR into a 500 Internal Server Error. This misleading response obfuscates the distinction between client-side and server-side errors, violating REST API best practices. Clients may receive inaccurate status codes, complicating error diagnosis and response management, especially when malformed requests are sent. The issue has been resolved in version 1.4.2.

Affected Version(s)

free5gc < 1.4.2

References

https://github.com/free5gc/free5gc/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/free5gc/free5gc/issues/783
x_refsource_MISC
https://github.com/free5gc/udm/pull/79
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.