Low 2.1Published Mar 20, 2026

CVE-2026-33221Nhost Storage Affected by MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload

Updated under an hour ago (Oct 26, 2026, 8:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 2.1 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness (CWE): CWE-345, CWE-343
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nhost nhost nhost:nhost (from the name)	before 0.12.0	CNA record
nhost storage nhost:storage	before 0.12.0	NVD

References

References

https://github.com/nhost/nhost/security/advisories/GHSA-g9f6-9775-hffm	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/nhost/nhost/pull/4018	x-refsource-misc, issue-tracking, patch
https://github.com/nhost/nhost/commit/c4bd53f042d7f568e567e18e2665af81660fce85	x-refsource-misc, patch
https://github.com/nhost/nhost/releases/tag/storage%400.12.0	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.