---
id: CVE-2026-55068
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 4.2.2 and
  earlier, the NRF RegisterNFInstance handler at PUT
  /nnrf-nfm/v1/nf-instances/{nfInstanceID} accepts NF Profiles without enforcing
  UUID format, nfStatus enum va…
severity: critical
cwe:
  - CWE-20
vendor: free5gc
product: github.com/free5gc/free5gc
affected:
  - github.com/free5gc/free5gc < 4.2.2
patched:
  - github.com/free5gc/free5gc 4.2.2
published: '2026-08-28'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:11:31.703'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55068'
references:
  - url: 'https://github.com/free5gc/free5gc/issues/1056'
    label: security-advisories@github.com
  - url: 'https://github.com/free5gc/free5gc/releases/tag/v4.2.3'
    label: security-advisories@github.com
  - url: 'https://github.com/free5gc/free5gc/security/advisories/GHSA-x8mj-6p3q-g5pp'
    label: security-advisories@github.com
  - url: >-
      https://github.com/free5gc/nrf/commit/bda0cf75be5556bb4c758c8b34710f3fe6bbe3ea
    label: security-advisories@github.com
  - url: >-
      https://github.com/free5gc/nrf/commit/fcd3cfaa27cc4dc17172ee0c4c3e0a3a696297c6
    label: security-advisories@github.com
  - url: 'https://github.com/free5gc/nrf/pull/90'
    label: security-advisories@github.com
  - url: 'https://github.com/free5gc/nrf/releases/tag/v1.4.5'
    label: security-advisories@github.com
  - url: 'https://github.com/free5gc/free5gc/security/advisories/GHSA-x8mj-6p3q-g5pp'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-x8mj-6p3q-g5pp'
tags:
  - nvd
  - ghsa
  - go
epss: 0.0059
epssPercentile: 0.45852
aliases:
  - GHSA-x8mj-6p3q-g5pp
ecosystem: go
ingestedAt: '2026-08-28T17:22:56.362Z'
---

## Overview

free5GC is an open-source implementation of the 5G core network. In 4.2.2 and earlier, the NRF RegisterNFInstance handler at PUT /nnrf-nfm/v1/nf-instances/{nfInstanceID} accepts NF Profiles without enforcing UUID format, nfStatus enum values, heartBeatTimer ranges, mandatory profile fields, or nfServices.ipEndPoints address constraints. The invalid profiles are persisted in the MongoDB NfProfile collection and returned by NFDiscover, allowing an attacker with SBI access to advertise attacker-controlled network-function endpoints and redirect control-plane signaling. This can expose credentials and signaling, alter service discovery integrity, and deny service across network functions that trust the NRF. This issue is fixed in version 4.2.3.

## Remediation

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

## Package advisory (CVE-2026-55068)

Affected packages:

- `github.com/free5gc/free5gc < 4.2.2`

Patched in:

- `github.com/free5gc/free5gc 4.2.2`

Source: https://github.com/advisories/GHSA-x8mj-6p3q-g5pp