# CVE-2026-33658: rails: Active Storage allows users to attach cloud and local files in Rails applications

CVE-2026-33658 is fixed in rails on 1 platform, first by DEBIAN-CVE-2026-33658, released March 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-33658
- Priority: Routine
- CVSS: 6.5 (medium)
- EPSS: 0.0045
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 26, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | rails Debian 13.5 (trixie) | 2:7.2.2.2+dfsg-2~deb13u2 | [DEBIAN-CVE-2026-33658](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33658.md) | Mar 26, 2026 |
| Linux | rails Debian 14 | 2:7.2.3.1+dfsg-1 | [DEBIAN-CVE-2026-33658](https://patchblox.com/security/data/fix/linux/debian-cve-2026-33658.md) | Mar 26, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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