CVE-2026-42459CWE-20CWE-209

CVE-2026-42459

High · published May 27, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
38.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00448 · 38.0th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-209 · Generation of Error Message Containing Sensitive Information
Published
2026-05-27T21:16Z
Affected products (1)
ProductVersionsFixed in
free5gc/free5gc< 4.2.24.2.2
References (2)
https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr · [email protected]https://github.com/free5gc/free5gc/security/advisories/GHSA-585v-hcgf-jhfr · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 27 MAY 15:53Z
    free5GC: Improper Input Validation and Generation of Error Message Containing Sensitive Information in github.com/free5gc/udm
    cvelistv5