CVE-2026-33221

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 93% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

March 20, 2026

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Aug 7, 2026
Patch available. Sources: github_pr, github_release, github, github_commit.
github Patch Available

MIME Type Spoofing via Trusted Client Content-Type Header in Storage Upload · Advisory · nhost/nhost · GitHub

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

[email protected]

Patch available: nhost/nhost [email protected]

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

fix(storage): always detect mimetype when uploading files

Patch available: nhost/nhost [email protected] (PR #4018 merged 2026-03-18)

https://github.com/nhost/nhost/pull/4018
github_commit Patch Available

commit c4bd53f042d7 (nhost/nhost)

Patch available: nhost/nhost [email protected] (contains commit c4bd53f042d7)

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

Vendor Advisories for CVE-2026-33221(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/nhost/nhost—0.0.0-20260318074820-c4bd53f042d7—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 141 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
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  16. 2026-09-02 16:38 UTCOSV refresh
  17. 2026-09-02 14:11 UTCEPSS rescore
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  1. 2026-08-23 00:19 UTCEPSS rescore
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  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 13:48 UTCEPSS rescore
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  8. 2026-08-16 14:56 UTCEPSS rescore
  9. 2026-08-16 10:59 UTCEG score recompute
  10. 2026-08-16 02:14 UTCEPSS rescore
  11. 2026-08-15 01:30 UTCEPSS rescore
  12. 2026-08-14 07:09 UTCEG score recompute
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  14. 2026-08-12 21:49 UTCEG score recompute
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  18. 2026-08-10 06:59 UTCEG score recompute
  19. 2026-08-09 13:46 UTCEPSS rescore
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  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-07 17:12 UTCEG score recompute
  23. 2026-08-06 13:46 UTCEPSS rescore
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  25. 2026-08-05 19:17 UTCEPSS rescore
  26. 2026-08-04 15:10 UTCEPSS rescore
  27. 2026-08-04 10:38 UTCEPSS rescore
  28. 2026-08-04 00:33 UTCEG score recompute
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  30. 2026-08-02 16:08 UTCEG score recompute
  31. 2026-08-02 02:27 UTCEPSS rescore
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  40. 2026-07-24 14:17 UTCEPSS rescore
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  42. 2026-07-23 14:18 UTCEPSS rescore
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  44. 2026-07-23 03:09 UTCEG score recompute
  45. 2026-07-22 14:08 UTCEPSS rescore
  46. 2026-07-21 15:24 UTCEPSS rescore
  47. 2026-07-20 17:08 UTCEPSS rescore
  48. 2026-07-19 14:31 UTCEPSS rescore
  49. 2026-07-19 02:29 UTCEPSS rescore
  50. 2026-07-18 10:04 UTCEPSS rescore
  51. 2026-07-17 07:16 UTCOSV refresh
  52. 2026-07-16 17:03 UTCEPSS rescore
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  54. 2026-07-15 16:57 UTCEPSS rescore
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  73. 2026-06-30 23:22 UTCEPSS rescore
  74. 2026-06-29 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-33221?
CVE-2026-33221 is a medium vulnerability published on March 20, 2026. 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,…
When was CVE-2026-33221 disclosed?
CVE-2026-33221 was first published in the National Vulnerability Database on March 20, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-33221 actively exploited?
CVE-2026-33221 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.9% of all scored CVEs.
What is the CVSS score of CVE-2026-33221?
CVE-2026-33221 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-33221?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33221, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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