| Name | CVE-2026-33173 |
| 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, `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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1132035 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| rails (PTS) | bullseye | 2:6.0.3.7+dfsg-2+deb11u2 | vulnerable |
| bullseye (security) | 2:6.0.3.7+dfsg-2+deb11u4 | vulnerable | |
| bookworm, bookworm (security) | 2:6.1.7.10+dfsg-1~deb12u2 | vulnerable | |
| trixie (security), trixie | 2:7.2.2.2+dfsg-2~deb13u1 | vulnerable | |
| forky | 2:7.2.3+dfsg-3 | vulnerable | |
| sid | 2:7.2.3.1+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| rails | source | (unstable) | 2:7.2.3.1+dfsg-1 | 1132035 |
[trixie] - rails <no-dsa> (Minor issue)
[bookworm] - rails <no-dsa> (Minor issue)
https://github.com/rails/rails/security/advisories/GHSA-qcfx-2mfw-w4cg
Fixed by: https://github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9cd02a7c8057d0 (v8.1.2.1)
Fixed by: https://github.com/rails/rails/commit/8fcb934caadc79c8cc4ce53287046d0f67005b3e (v8.0.4.1)
Fixed by: https://github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d43b28dfaae7e53 (v7.2.3.1)