CVE-2026-33221

LOW2.1

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

Published Mar 20, 2026

Modified 4 weeks ago

Details

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.

References

WEB

https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85

WEB

https://github.com/nhost/nhost/pull/4018

WEB

https://github.com/nhost/nhost/releases/tag/storage%400.12.0

WEB

https://github.com/nhost/nhost/security/advisories/GHSA-g9f6-9775-hffm

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-33221

CVSS Analysis