CVE-2026-33174
Fixed in a distro release EPSS <1%CVSS 6.6
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, when serving files through Active Storage's proxy delivery mode, the proxy 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. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Products: Rails activestorage
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| RubyGems | activestorage | 8.1.2.1 |
| RubyGems | activestorage | 8.0.4.1 |
| RubyGems | activestorage | 7.2.3.1 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | gitlab-rails-ce-18.1 | no fix |
| Chainguard | gitlab-rails-ce-18.10 | 18.10.3-r1 |
| Chainguard | gitlab-rails-ce-18.2 | no fix |
| Chainguard | gitlab-rails-ce-18.3 | no fix |
| Chainguard | gitlab-rails-ce-18.4 | no fix |
| Chainguard | gitlab-rails-ce-18.5 | no fix |
| Chainguard | gitlab-rails-ce-18.6 | no fix |
| Chainguard | gitlab-rails-ce-18.7 | no fix |
| Chainguard | gitlab-rails-ce-18.8 | 18.8.11-r4 |
| Chainguard | gitlab-rails-ce-18.9 | 18.9.5-r0 |
| Chainguard | gitlab-rails-ce-fips-18.1 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.10 | 18.10.3-r0 |
| Chainguard | gitlab-rails-ce-fips-18.2 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.3 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.4 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.5 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.6 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.7 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.8 | no fix |
| Chainguard | gitlab-rails-ce-fips-18.9 | 18.9.5-r0 |
| Chainguard | ruby3.2-rails-7.1 | no fix |
| Chainguard | ruby3.2-rails-8.1 | 8.1.3-r0 |
| Chainguard | ruby3.3-rails-7.1 | no fix |
| Chainguard | ruby3.4-rails-7.1 | no fix |
| Chainguard | ruby3.4-rails-8.0 | 8.0.5-r0 |
| Chainguard | ruby4.0-rails-7.1 | no fix |
| Debian 13 | rails | 2:7.2.2.2+dfsg-2~deb13u2 |
| Debian 14 | rails | 2:7.2.3.1+dfsg-1 |
| Ubuntu 24.04 LTS | rails | no fix |
| Ubuntu 25.10 | rails | no fix |
| Ubuntu 26.04 LTS | rails | no fix |
| Ubuntu 26.10 | rails | no fix |
| Ubuntu Pro 16.04 LTS | rails | no fix |
| Ubuntu Pro 18.04 LTS | rails | no fix |
| Ubuntu Pro 20.04 LTS | rails | no fix |
| Ubuntu Pro 22.04 LTS | rails | no fix |
| Wolfi | ruby3.2-rails-8.1 | 8.1.3-r0 |