GHSA-p9fm-f462-ggrg
Rails Active Storage has a possible DoS vulnerability in proxy mode via multi-range requests
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | activestorage | >= 8.1.0, < 8.1.2.1 | 8.1.2.1 |
| RubyGems | activestorage | >= 8.0.0, < 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
Active Storage's proxy controller does not limit the number of byte ranges in an HTTP Range header. A request with thousands of small ranges causes disproportionate CPU usage compared to a normal request for the same file, possibly resulting in a DoS vulnerability.
### Releases
The fixed releases are available at the normal locations.
### Credit
This issue was responsibly reported by Hackerone researcher [thwin_htet](https://hackerone.com/thwin_htet).
References
External links from the advisory. They lead to third-party sites.
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
- https://nvd.nist.gov/vuln/detail/CVE-2026-33658
- 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-2026-33658.yml