Description
Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1
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. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| rails | activestorage | >= 8.1.0, < 8.1.2.1, >= 8.0.0, < 8.0.4.1, < 7.2.3.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | rails | 2:7.2.3.1+dfsg-1 | — |
| Debian 13 | rails | 2:7.2.2.2+dfsg-2~deb13u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | rails | No fix yet | — |
| Ubuntu 26.04 LTS | rails | No fix yet | — |
| Ubuntu 25.10 | rails | No fix yet | — |
| Ubuntu 24.04 LTS | rails | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | rails | No fix yet | — |
| Ubuntu Pro 20.04 LTS | rails | No fix yet | — |
| Ubuntu Pro 18.04 LTS | rails | No fix yet | — |
| Ubuntu Pro 16.04 LTS | rails | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | activestorage | >= 8.1.0, < 8.1.2.1 | 8.1.2.1 | GHSA-p9fm-f462-ggrg |
| RubyGems | activestorage | >= 8.0.0, < 8.0.4.1 | 8.0.4.1 | GHSA-p9fm-f462-ggrg |
| RubyGems | activestorage | < 7.2.3.1 | 7.2.3.1 | GHSA-p9fm-f462-ggrg |
Advisories 1
- WID-SEC-2026-0833 Ruby on Rails: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 8, 2026
References
- https://github.com/rails/rails/security/advisories/GHSA-p9fm-f462-ggrg
- 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