CVE•Published 2026-05-27•Modified 2026-05-28•0 articles on news•5 live references•NVD data

CVE-2026-42459Free5gc · Free5gc

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

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

EPSS percentile

—

Weaknesses (CWE)

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

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.

Timeline

Published 2026-05-27

Modified 2026-05-28

External references

NVD MITRE Exploit-DB Sploitus VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-42459

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Free5gc Free5gc"

All exposed Free5gc Free5gc instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Free5gc"

HTTP body or banner mentions "Free5gc" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-42459