CVE-2026-33221: Nhost is an open source Firebase alternative with GraphQL

Q: How do I fix CVE-2026-33221?

storage: upgrade to 0.12.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33221 being exploited?

CVE-2026-33221 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33221 affect?

CVE-2026-33221 affects storage. Severity is medium (CVSS 5.3). 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

Q: How urgent is CVE-2026-33221?

Priority 25/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-33221 is a medium-severity flaw (CVSS 5.3) affecting storage. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-343, CWE-345
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nhost

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 23:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

nhost storage UPGRADE

Affected: < 0.12.0

Fixed in: 0.12.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy storage || rpm -q storage || storage --version

2. UPGRADE to 0.12.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade storage

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade storage

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33221?

storage: upgrade to 0.12.0. Exact commands for each OS are on this page.

Is CVE-2026-33221 being exploited?

CVE-2026-33221 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33221 affect?

CVE-2026-33221 affects storage. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2026-33221?

Priority 25/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-4091 MEDIUM 6.5 UPGRADE MITIGATE A vulnerability was discovered in Samba, where the flaw allows SMB clients to truncate files, even with read-o
CVE-2023-42669 MEDIUM 6.5 UPGRADE DOWNGRADE A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba
CVE-2023-3961 CRITICAL 9.1 UPGRADE DOWNGRADE A path traversal vulnerability was identified in Samba when processing client pipe names connecting to Unix do
CVE-2023-3347 MEDIUM 5.9 UPGRADE DOWNGRADE A vulnerability was found in Samba's SMB2 packet signing mechanism
CVE-2023-34968 MEDIUM 5.3 UPGRADE MITIGATE A path disclosure vulnerability was found in Samba

References

← Back to latest CVEs