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, 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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
rails activestorage
>= 8.1.0.beta1, < 8.1.2.1affected>= 8.0.0.beta1, < 8.0.4.1affected< 7.2.3.1affected
References
- https://github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87 ↗
- https://github.com/rails/rails/commit/4933c1e3b8c1bb04925d60347be9f69270392f2c ↗
- https://github.com/rails/rails/commit/9b06fbc0f504b8afe333f33d19548f3b85fbe655 ↗
- https://github.com/rails/rails/commit/a290c8a1ec189d793aa6d7f2570b6a763f675348 ↗
- https://github.com/rails/rails/releases/tag/v7.2.3.1 ↗
- https://github.com/rails/rails/releases/tag/v8.0.4.1 ↗
- https://github.com/rails/rails/releases/tag/v8.1.2.1 ↗
- https://access.redhat.com/security/cve/CVE-2026-33195 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2450546 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33195.json ↗