Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/sysadminsmedia/homebox/commit/42c52f7f7566b7fbd8017352187af20
- https://github.com/sysadminsmedia/homebox/releases/tag/v0.26.0
- https://github.com/sysadminsmedia/homebox/security/advisories/GHSA-r9pf-rg22-655
FAQ
What is CVE-2026-55473?
CVE-2026-55473 is a documented vulnerability. 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...
How severe is CVE-2026-55473?
CVSS scoring is not yet available for CVE-2026-55473. Check NVD for updates.
Is there a patch for CVE-2026-55473?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.