CVE-2026-33173 : faille moyenne rubyonrails rails (CVSS 5.3)

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.

Sévérité

Moyenne (CVSS 5.3)

Vecteur CVSS

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploitation active

Non signalée par la CISA

Publication

24 mars 2026

Dernière mise à jour

17 juin 2026

• rubyonrails rails

• Fiche CVE-2026-33173 sur le NVD (NIST)
• github.com/rails/rails/commit/707c0f1f41f067fdf96d54e99d4…
• github.com/rails/rails/commit/8fcb934caadc79c8cc4ce532870…
• github.com/rails/rails/commit/d9502f5214e2198245a4c1defe9…
• github.com/rails/rails/releases/tag/v7.2.3.1
• github.com/rails/rails/releases/tag/v8.0.4.1
• github.com/rails/rails/releases/tag/v8.1.2.1
• github.com/rails/rails/security/advisories/GHSA…