GHSA-9xrj-h377-fr87
Rails Active Storage has possible Path Traversal in DiskService
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | activestorage | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
| RubyGems | activestorage | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
| RubyGems | activestorage | < 7.2.3.1 | 7.2.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
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.
### Releases
The fixed releases are available at the normal locations.
### Credit
This issue was responsibly reported by Hackerone researcher [ksw9722](https://hackerone.com/ksw9722).
References
External links from the advisory. They lead to third-party sites.
- https://github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87
- https://nvd.nist.gov/vuln/detail/CVE-2026-33195
- 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
- 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://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33195.yml