{"id":"CVE-2026-33221","aliases":["GHSA-g9f6-9775-hffm","GO-2026-4759"],"url":"https://o3.security/vulnerability/CVE-2026-33221","summary":"Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload","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.","published":"2026-03-20T23:00:18.342Z","modified":"2026-07-31T18:29:57.053800653Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/nhost/nhost","fixedVersion":"0.0.0-20260318074820-c4bd53f042d7"}],"fix":{"url":"https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85","label":"nhost/nhost@c4bd53f"},"references":[{"type":"WEB","url":"https://github.com/nhost/nhost/releases/tag/storage%400.12.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33221.json"},{"type":"ADVISORY","url":"https://github.com/nhost/nhost/security/advisories/GHSA-g9f6-9775-hffm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33221"},{"type":"FIX","url":"https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85"},{"type":"FIX","url":"https://github.com/nhost/nhost/pull/4018"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:29:57.053800653Z"}}