Input Validation Flaw in free5GC UDM Component Exposes Internal Details
CVE-2026-42459

7.7HIGH

Key Information:

Vendor

Free5gc

Status
Free5gc
Vendor
CVE Published:
27 May 2026

What is CVE-2026-42459?

The free5GC UDM component in versions prior to 4.2.2 contains an input validation error that can be exploited via six GET handlers of the nudm-sdm service. An attacker can submit a malformed SUPI parameter, leading to a 500 Internal Server Error. This error reveals sensitive internal details of the infrastructure, compromising the integrity of the system.

Affected Version(s)

free5gc < 4.2.2

References

https://github.com/free5gc/free5gc/security/advisories/GH...
x_refsource_CONFIRM

CVSS V4

Score:
7.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.