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bdu:2026-08992

certfr-2026-avi-0349 — De multiples vulnérabilités ont été découvertes dans les produits Ruby on Rails. Certaines d'entre elles permettent à u…

certfr-2026-avi-0349

EUVD-2026-277175

fkie_cve-2026-33173

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.

GHSA-qcfx-2mfw-w4cg — Rails Active Storage has possible content type bypass via metadata in direct uploads

Affected: RubyGems: activestorage

### Impact Active Storage's `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 malicious direct-upload client could set these flags.

### Releases The fixed releases are available at the normal locations.

### Credit This was responsible reported by Hackerone researcher [pwnie](https://hackerone.com/pwnie)

UBUNTU-CVE-2026-33173

Affected: Ubuntu:Pro:16.04:LTS: rails, Ubuntu:Pro:18.04:LTS: rails, Ubuntu:Pro:20.04:LTS: rails, Ubuntu:Pro:22.04:LTS: rails, Ubuntu:24.04:LTS: rails, Ubuntu:25.10: rails, Ubuntu:26.04:LTS: rails

WID-SEC-W-2026-0833 — Ruby on Rails: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Ruby on Rails ausnutzen, um einen Denial of Service Angriff durchzuführen, um Dateien zu manipulieren, und um einen Cross-Site Scripting Angriff durchzuführen.