CVSS 4.0
8.0 highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:UCVE-2026-33195
High (8.0) in rubyonrails rails. EPSS 0.6% chance of exploitation in the next 30 days. Fixed in activestorage 7.2.3.1, 8.0.4.1, 8.1.2.1.
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.
Severity
CVSS 3.1
9.8 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
- CWE
- CWE-22
- Published
- Modified
- Record from
- the NVD, synced
Affected
- rubyonrails:rails
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-9xrj-h377-fr87 | RubyGems | activestorage | >=8.1.0.beta1 <8.1.2.1 | 8.1.2.1 |
| GHSA-9xrj-h377-fr87 | RubyGems | activestorage | >=8.0.0.beta1 <8.0.4.1 | 8.0.4.1 |
| GHSA-9xrj-h377-fr87 | RubyGems | activestorage | <7.2.3.1 | 7.2.3.1 |
References
- 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