GHSA-r46p-8f7g-vvvg
Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | activestorage | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
| RubyGems | activestorage | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
| RubyGems | activestorage | < 7.2.3.1 | 7.2.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### 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.
### Credit
This issue was responsibly reported by Hackerone user [pirikara](https://hackerone.com/pirikara)
References
External links from the advisory. They lead to third-party sites.
- https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg
- https://nvd.nist.gov/vuln/detail/CVE-2026-33174
- 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
- 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/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33174.yml