ruby-advisory-db/gems/activestorage/CVE-2026-33174.yml at 03c7702be716a958a2e0b095e08c2ab0736cd55e · rubysec/ruby-advisory-db · GitHub

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---
gem: activestorage
framework: rails
cve: 2026-33174
ghsa: r46p-8f7g-vvvg
url: https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg
title: Rails Active Storage has a possible DoS vulnerability when in proxy mode via
  Range requests
date: 2026-03-23
description: |
  ### Impact
  When serving files through Active Storage's `Blobs::ProxyController`,
  the controller loads the entire requested byte range into memory before sending it.
  A request with a large or unbounded Range header (e.g. `bytes=0-`) could cause the server
  to allocate memory proportional to the file size, possibly resulting in a DoS vulnerability through memory exhaustion.

  ### 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-r46p-8f7g-vvvg
    - https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5
    - https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a
    - https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b
    - 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-r46p-8f7g-vvvg