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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-33173)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-33173)

ID	Name	Product	Family	Type	Severity
303648	Linux Distros Unpatched Vulnerability : CVE-2026-33173	Nessus	Misc.	Local	medium
439112	SCA: security update for activestorage (GHSA-qcfx-2mfw-w4cg)	Tenable Cloud Security	SCA Checks	Local	medium
439112	SCA: security update for activestorage (GHSA-qcfx-2mfw-w4cg)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium

Detections

Analytics

CVE-2026-33173

medium

Tenable Plugins

medium

medium

medium