---
id: CVE-2026-55473
title: HomeBox is a home inventory and organization system
summary: >-
  HomeBox is a home inventory and organization system. Prior to 0.26.0, the
  default-on BlockBogonNets and BlockCloudMetadata notifier SSRF protections in
  backend/internal/sys/validate/notifier_url.go do not inspect IPv4 destinations
  embedd…
severity: medium
cvss: 6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-918
vendor: sysadminsmedia
product: homebox
affected:
  - homebox < 0.26.0
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:26:49.087'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55473'
references:
  - url: >-
      https://github.com/sysadminsmedia/homebox/commit/42c52f7f7566b7fbd8017352187af20f552a4471
    label: security-advisories@github.com
  - url: 'https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-r9pf-rg22-655m
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
epss: 0.00414
epssPercentile: 0.32968
cvssSource: cna
ingestedAt: '2026-09-21T18:50:57.564Z'
---

## Overview

HomeBox is a home inventory and organization system. Prior to 0.26.0, the default-on BlockBogonNets and BlockCloudMetadata notifier SSRF protections in backend/internal/sys/validate/notifier_url.go do not inspect IPv4 destinations embedded in the NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48. An authenticated user can submit a generic:// notifier through POST /v1/notifiers or POST /v1/notifiers/test, and on a Homebox instance that egresses through NAT64/DNS64, the gateway can translate an accepted IPv6 destination to cloud metadata, localhost, or another internal IPv4 host. The notifier test path returns delivery result information, and Shoutrrr propagates the response, providing feedback that can disclose retrieved metadata such as temporary credentials. Without NAT64 egress, the crafted IPv6 destination is not routable, but the guard still incorrectly classifies it as safe. This issue is fixed in version 0.26.0.

## Remediation

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