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TI-2026-25642 Aliases CVE-2026-33221GHSA-g9f6-9775-hffm

Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload

Priority LOW 10CWE-343Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
High
Attack requirements
None
Impact type
Security bypass, Code execution
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-345 and CWE-434.

Summary

Nhost is an open source Firebase alternative with GraphQL. Prior to version 0.12.0, the storage service's file upload handler trusts the client-provided Content-Type header without performing server-side MIME type detection. This allows an attacker to upload files with an arbitrary MIME type, bypassing any MIME-type-based restrictions configured on storage buckets. This issue has been patched in version 0.12.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00184 8th percentileScored 2026-11-07
Fix Fixed nhost (nhost): 0.12.0github.com/nhost/nhost (Go): 0.0.0-20260318074820-c4bd53f042d7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nhostnhostbefore 0.12.00.12.0Patch availableCNA
—github.com/nhost/nhost (Go)before 0.0.0-20260318074820-c4bd53f042d70.0.0-20260318074820-c4bd53f042d7Patch availableGHSA-g9f6-9775-hffm
  • nhost Vendornhost Affected before 0.12.0 Fixed in 0.12.0 Patch available CNA
  • github.com/nhost/nhost (Go) Vendor— Affected before 0.0.0-20260318074820-c4bd53f042d7 Fixed in 0.0.0-20260318074820-c4bd53f042d7 Patch available GHSA-g9f6-9775-hffm

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nhost:storage:*:*:*:*:*:*:*:*before 0.12.0Vulnerablenhost
  • cpe:2.3:a:nhost:storage:*:*:*:*:*:*:*:* Versions before 0.12.0 Vulnerable ·nhost

Remediation

  • Fix · CNA nhost (nhost) Fixed in 0.12.0
  • Fix · GHSA-g9f6-9775-hffm github.com/nhost/nhost (Go) Fixed in 0.0.0-20260318074820-c4bd53f042d7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33221
  2. 2026-10-03 Alias added: GHSA-g9f6-9775-hffm

References

Patch 2

Advisory 2

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences