GHSA-r46p-8f7g-vvvg
Rails Active Storage has a possible DoS vulnerability when in proxy mode via Range requests
At a glance
- Published
- Updated
- CVE
- CVE-2026-33174
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
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. ### Credit This issue was responsibly reported by Hackerone user [pirikara](https://hackerone.com/pirikara)
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-r46p-8f7g-vvvg WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33174 ADVISORY
- https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5 WEB
- https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a WEB
- https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b 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-2026-33174.yml WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |