---
id: CVE-2026-47780
title: free5GC is an open-source implementation of the 5G core network
summary: >-
  free5GC is an open-source implementation of the 5G core network. In 4.2.3 and
  earlier, HandleCreateEeSubscriptions and HandleQueryeesubscriptions in
  free5gc/udr internal/sbi/api_datarepository.go validate the ueId path value
  with a regul…
severity: medium
cvss: 6.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-20
vendor: free5gc
product: free5gc
affected:
  - free5gc <= 4.2.2
published: '2026-09-15'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T16:17:11.343'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47780'
references:
  - url: 'https://github.com/free5gc/free5gc/security/advisories/GHSA-6gxq-gpr8-xgjp'
    label: security-advisories@github.com
  - url: 'https://github.com/free5gc/free5gc/security/advisories/GHSA-6gxq-gpr8-xgjp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-6gxq-gpr8-xgjp'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T15:25:04.815486Z'
cvssSource: cna
aliases:
  - GHSA-6gxq-gpr8-xgjp
ecosystem: go
ingestedAt: '2026-07-07T15:41:59.513Z'
epss: 0.00395
epssPercentile: 0.33518
---

## Overview

free5GC is an open-source implementation of the 5G core network. In 4.2.3 and earlier, HandleCreateEeSubscriptions and HandleQueryeesubscriptions in free5gc/udr internal/sbi/api_datarepository.go validate the ueId path value with a regular expression whose final .+ alternative accepts every non-empty string instead of restricting identifiers to supported SUPI and GPSI formats. An actor with network reachability to the UDR SBI can submit a non-3GPP identifier to /nudr-dr/v2/subscription-data/{ueId}/context-data/ee-subscriptions, causing the identifier to pass validation and enter the normal create or query flow. The advisory does not independently establish whether authentication is required. Invalid identifiers can be persisted and retrieved as subscription records, enabling unauthorized data creation, UDR namespace pollution, persistent subscriber-metadata corruption, and interference with downstream components that trust stored identifiers to use valid 3GPP formats. The exposure is most relevant in lab, test, or loosely segmented service-based-interface deployments where direct UDR access is possible.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-47780)

Affected packages:

- `github.com/free5gc/udr <= 1.4.3`

Source: https://github.com/advisories/GHSA-6gxq-gpr8-xgjp