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CVE-2026-55473— HomeBox: Notifier SSRF guard misses NAT64 prefixes (64:ff9b::/96, 64:ff9b:1::/48) — generic:// URL reaches cloud metadata on NAT64 egress

Quick assessment

Affected
sysadminsmedia homebox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 prefixe

CVSS 6.0 · Medium EPSS 0.24% · P15

Affected Version Matrix 1

VendorProduct Version RangeStatus
sysadminsmedia homebox < 0.26.0 affected
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I. Basic Information for CVE-2026-55473

Vulnerability Information

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Vulnerability Title
HomeBox: Notifier SSRF guard misses NAT64 prefixes (64:ff9b::/96, 64:ff9b:1::/48) — generic:// URL reaches cloud metadata on NAT64 egress
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sysadminsmedia homebox < 0.26.0 -

II. Public POCs for CVE-2026-55473

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III. Intelligence Information for CVE-2026-55473

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Patches & Fixes for CVE-2026-55473 (1)

Other References for CVE-2026-55473 (2)

Same Patch Batch · sysadminsmedia · 2026-09-21 · 5 CVEs total

CVE-2026-48976 8.1 HIGH HomeBox: Cross-Tenant IDOR in Notifier Update Leaks Shoutrrr Credentials and Allows Webhoo
CVE-2026-48826 8.1 HIGH HomeBox: Cross-Group Inventory Wipe in Homebox via Global Owner Role and X-Tenant Header S
CVE-2026-48975 8.1 HIGH HomeBox: Cross-Tenant IDOR in MaintenanceEntry Update and Delete Allows Tampering and Dest
CVE-2026-48974 5.4 MEDIUM HomeBox: Forced Group Membership Without Consent in Homebox AddMember Handler

IV. Related Vulnerabilities

Same product: homebox
Same vendor: sysadminsmedia
Same weakness: CWE-918

V. Comments for CVE-2026-55473

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