Rubyonrails Rails — CVE-2026-33195 (Critical)

Date Mar 24, 2026

Type Vendor advisory

Signal Critical vendor advisory

Vendor / Product Rubyonrails · Rails

CVE CVE-2026-33195

Critical vendor advisory CVE-2026-33195

Summary

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, Active Storage's `DiskService#path_for` does not validate that the resolved filesystem path remains within the storage root directory. If a blob key containing path traversal sequences (e.g. `../`) is used, it could allow reading, writing, or deleting arbitrary files on the server. Blob keys are expected to be trusted strings, but some applications could be passing user input as keys and would be affected. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Why it matters

This CVE carries a CRITICAL severity rating (CVSS 9.8) in Rubyonrails Rails. Patch or mitigate promptly.

Operator check

Review CVE-2026-33195 in your asset inventory. Apply patches per vendor guidance and verify Rails is not exposed. CVSS score: 9.8.

Sources

NVD — CVE-2026-33195 Vendor reference Vendor reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

Get watched-vendor alerts Subscribe free Back to feed