GHSA-qcfx-2mfw-w4cg
Rails Active Storage has possible content type bypass via metadata in direct uploads
At a glance
- Published
- Updated
- CVE
- CVE-2026-33173
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Description
### Impact Active Storage's `DirectUploadsController` accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like `identified` and `analyzed` are stored in the same metadata hash, a malicious direct-upload client could set these flags. ### Releases The fixed releases are available at the normal locations. ### Credit This was responsible reported by Hackerone researcher [pwnie](https://hackerone.com/pwnie)
Affected packages
| Package | Versions |
|---|---|
| RubyGems · activestorage | introduced 8.1.0.beta1, fixed 8.1.2.1 |
| RubyGems · activestorage | introduced 8.0.0.beta1, fixed 8.0.4.1 |
| RubyGems · activestorage | introduced 0, fixed 7.2.3.1 |
References
- https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33173 ADVISORY
- https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53 WEB
- https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3e WEB
- https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0 WEB
- https://github.com/rails/rails PACKAGE
- https://github.com/rails/rails/releases/tag/v7.2.3.1 WEB
- https://github.com/rails/rails/releases/tag/v8.0.4.1 WEB
- https://github.com/rails/rails/releases/tag/v8.1.2.1 WEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33173.yml WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |