CVE-2026-55473

Description

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: MEDIUM
CVSS score: 6.0 / 10
CVSS vector: 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
Effective score: 6.0 / 10 MEDIUM source: CNA overview
CWE(s): CWE-918
Reserved: 2026-06-16
Published: 2026-09-21 17:44 UTC
Last updated: 2026-09-21 17:44 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/55xxx/CVE-2026-55473.json

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-21 18:17:08 UTC
NVD last modified: 2026-09-21 18:17:08 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84037
Assigner: GitHub_M
Published: Sep 21, 2026, 5:44:41 PM
Updated: Sep 21, 2026, 5:44:41 PM
EUVD base score (CVSS 4.0): 6.0 / 10
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
EUVD-reported EPSS: 0.0000
Vendors: sysadminsmedia
Products: homebox (< 0.26.0)

ENISA description: 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.

EUVD references (3)

Affected products (1)

Vendor	Product	Versions	Platforms
sysadminsmedia	homebox	`< 0.26.0` (affected)	—

Vendor references (3)

References embedded in the original CVE record by the assigning CNA.

https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-r9pf-rg22-655m x_refsource_CONFIRM
https://github.com/sysadminsmedia/homebox/commit/42c52f7f7566b7fbd8017352187af20f552a4471 x_refsource_MISC
https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (3)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/sysadminsmedia/homebox/commit/42c52f7f7566b7fbd8017352187af20f552a4471 security-advisories@github.com
https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0 security-advisories@github.com
https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-r9pf-rg22-655m security-advisories@github.com

Remediations (10)

CVE-2026-55473 | Vulnerability Database | Aqua Security

web:avd.aquasec.com

CVE-2026-55473 Vulnerability, Severity 0 N/A, Server-Side Request Forgery (SSRF)

2026-09-22 17:11 UTC
CVE-2026-55473 :: Enginsight Vulnerability Database

web:cve.enginsight.com

CVE-2026-55473 - HomeBox is a home inventory and organization system. Prior to 0.26.0, the default-on BlockBogonNets and BlockCloudMetadata notifier SSRF protections in …

2026-09-22 17:11 UTC
CVE-2026-55473 - Exploits & Severity - Feedly

web:feedly.com

Sep 21, 2026 at 11:05 AM CVE assignment NVD published the first details for CVE-2026-55473

2026-09-22 17:11 UTC
Description of the security update for Microsoft Exchange Server ...

web:support.microsoft.com

This security update resolves vulnerabilities in Microsoft Exchange Server. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures ( CVE ): CVE - 2026 -62910 - Microsoft Common Vulnerabilities and Exposures CVE - 2026 -62911 - Microsoft Common Vulnerabilities and Exposures CVE - 2026 -62912 - Microsoft Common Vulnerabilities and Exposures CVE - 2026 -62913 ...

2026-09-22 17:11 UTC
CVE-2026-55473 - SSRF Vulnerability in HomeBox 0.26.0 via…

web:vulmon.com

Vulnerability Summary Authenticated users can trigger a Server-Side Request Forgery (SSRF) in HomeBox versions prior to 0.26.0. The vulnerability exists in the BlockBogonNets and BlockCloudMetadata notifier protections, which fail to inspect IPv4 destinations within NAT64 prefixes 64:ff9b::/96 and 64:ff9b:1::/48. When an instance egresses through NAT64/DNS64, a crafted IPv6 destination can be ...

2026-09-22 17:11 UTC
CVE-2026-55473 - vulnerability database | Vulners.com

web:vulners.com

CVE-2026-55473 🗓️ 21 Sep 2026 10:44:41 Reported by GitHub_M Type cve 🔗 web.nvd.nist.gov 👁 4 Views

2026-09-22 17:11 UTC
CVE-2026-55473: HomeBox Notifier SSRF Bypass | Miggo

web:www.miggo.io

HomeBox notifier SSRF via crafted NAT64 prefix URLs bypasses guards, disclosing cloud metadata and internal host data through gateway IPv6-to-IPv4 translation.

2026-09-22 17:11 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-22 17:11 UTC
CVE-2026-55473: homebox SSRF (CVSS 6) — Fix & Details

web:www.strix.ai

How severe is CVE-2026-55473 ? CVE-2026-55473 has a CVSS score of 6/10 (MEDIUM severity). How do I fix CVE-2026-55473 ? Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

2026-09-22 17:11 UTC
CVE-2026-55473 | Tenable®

web:www.tenable.com

Vector: 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

2026-09-22 17:11 UTC

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-55473.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "homebox",
          "vendor": "sysadminsmedia",
          "versions": [
            {
              "status": "affected",
              "version": "< 0.26.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T17:44:41.474Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-r9pf-rg22-655m",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-r9pf-rg22-655m"
        },
        {
          "name": "https://github.com/sysadminsmedia/homebox/commit/42c52f7f7566b7fbd8017352187af20f552a4471",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysadminsmedia/homebox/commit/42c52f7f7566b7fbd8017352187af20f552a4471"
        },
        {
          "name": "https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0"
        }
      ],
      "source": {
        "advisory": "GHSA-r9pf-rg22-655m",
        "discovery": "UNKNOWN"
      },
      "title": "HomeBox: Notifier SSRF guard misses NAT64 prefixes (64:ff9b::/96, 64:ff9b:1::/48) \u2014 generic:// URL reaches cloud metadata on NAT64 egress"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55473",
    "datePublished": "2026-09-21T17:44:41.474Z",
    "dateReserved": "2026-06-16T22:10:37.609Z",
    "dateUpdated": "2026-09-21T17:44:41.474Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}