MEDIUM
GHSA-qcfx-2mfw-w4cg
Rails Active Storage has possible content type bypass via metadata in direct uploads
Quick fix
GHSA-qcfx-2mfw-w4cg — activestorage: upgrade to the fixed version with the command below.
bundle update activestorageDetails
### 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)
Are you affected?
Enter the version of the package you're using.
Affected packages
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]