CVE-2026-42459

free5GC: Improper Input Validation and Generation of Error Message Containing Sensitive Information in github.com/free5gc/udm

State: Published
Severity: 7.7 High
Published: May 27, 2026
Updated: May 28, 2026
Reserved: Apr 27, 2026

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Description

free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P	GitHub_M

Weaknesses

CWE-20 Improper Input Validation
CWE-209 Generation of Error Message Containing Sensitive Information

Affected Products

Product	Versions
free5gcfree5gc	< 4.2.2Affected

References

https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr

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