CVE-2026-33195
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Affected | — |
| sid | Fixed | 2:7.2.3.1+dfsg-1 |
| forky | Fixed | 2:7.2.3.1+dfsg-1 |
| bullseye | Affected | — |
| bookworm | Affected | — |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | activestorage | <~> 7.2.3, >= 7.2.3.1 | ~> 7.2.3, >= 7.2.3.1 |
| 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 |
| RUBYGEMS | activestorage | < 7.2.3.1 | 7.2.3.1 |
| RUBYGEMS | activestorage | >= 8.0.0.beta1, < 8.0.4.1 | 8.0.4.1 |
| RUBYGEMS | activestorage | >= 8.1.0.beta1, < 8.1.2.1 | 8.1.2.1 |
References
- https://github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87
- https://www.suse.com/security/cve/CVE-2026-33195.html
- 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
- https://security-tracker.debian.org/tracker/CVE-2026-33195
- https://github.com/advisories/GHSA-9xrj-h377-fr87
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.