ruby-advisory-db/gems/activestorage/CVE-2026-33173.yml at 03c7702be716a958a2e0b095e08c2ab0736cd55e · rubysec/ruby-advisory-db · GitHub

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---
gem: activestorage
framework: rails
cve: 2026-33173
ghsa: qcfx-2mfw-w4cg
url: https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg
title: Rails Active Storage has possible content type bypass via metadata in direct
  uploads
date: 2026-03-23
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.
patched_versions:
  - "~> 7.2.3, >= 7.2.3.1"
  - "~> 8.0.4, >= 8.0.4.1"
  - ">= 8.1.2.1"
related:
  url:
    - https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg
    - https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53
    - https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3e
    - https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0
    - https://github.com/rails/rails/releases/tag/v7.2.3.1
    - https://github.com/rails/rails/releases/tag/v8.0.4.1
    - https://github.com/rails/rails/releases/tag/v8.1.2.1
    - https://github.com/advisories/GHSA-qcfx-2mfw-w4cg