rails: Active Storage allows users to attach cloud and local files in Rails applications
CVE-2026-33173 is fixed in rails on 1 platform, first by DEBIAN-CVE-2026-33173, released March 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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, `DirectUploadsController` accepts arbitrary metadata from the client and persists it on the blob. Because internal flags like `identified` and `analyzed` are stored in the same metadata hash, a direct-upload client can set these flags to skip MIME detection and analysis. This allows an attacker to upload arbitrary content while claiming a safe `content_type`, bypassing any validations that rely on Active Storage's automatic content type identification. 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 12.15 (bookworm) | 2:6.1.7.10+dfsg-1~deb12u3 | DEBIAN-CVE-2026-33173 | Mar 24, 2026 |
| rails · Debian 13.5 (trixie) | 2:7.2.2.2+dfsg-2~deb13u2 | DEBIAN-CVE-2026-33173 | Mar 24, 2026 |
| rails · Debian 14 | 2:7.2.3.1+dfsg-1 | DEBIAN-CVE-2026-33173 | Mar 24, 2026 |
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