rails: Active Storage allows users to attach cloud and local files in Rails applications
CVE-2026-33174 is fixed in rails on 1 platform, first by DEBIAN-CVE-2026-33174, released March 24, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| rails · Debian 13.5 (trixie) | 2:7.2.2.2+dfsg-2~deb13u2 | DEBIAN-CVE-2026-33174 | Mar 24, 2026 |
| rails · Debian 14 | 2:7.2.3.1+dfsg-1 | DEBIAN-CVE-2026-33174 | Mar 24, 2026 |
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