Vulnerability · Published Mar 23, 2026 · Assigned by GitHub_M
CVE-2026-33195Rails Active Storage has possible Path Traversal in DiskService
High 8.1
In plain English
A high-severity path traversal in activestorage from rails. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rails | 2:6.1.7.10+dfsg-1~deb12u3 | DEBIAN-CVE-2026-33195 |
| Debian:13 | rails | 2:7.2.2.2+dfsg-2~deb13u2 | DEBIAN-CVE-2026-33195 |
| Debian:14 | rails | 2:7.2.3.1+dfsg-1 | DEBIAN-CVE-2026-33195 |
| RubyGems | activestorage | 8.1.2.1 | GHSA-9xrj-h377-fr87 |
| RubyGems | activestorage | 8.0.4.1 | GHSA-9xrj-h377-fr87 |
| RubyGems | activestorage | 7.2.3.1 | GHSA-9xrj-h377-fr87 |
| Ubuntu:24.04:LTS | rails | no fix listed | UBUNTU-CVE-2026-33195 |
| Ubuntu:25.10 | rails | no fix listed | UBUNTU-CVE-2026-33195 |
| Ubuntu:26.04:LTS | rails | no fix listed | UBUNTU-CVE-2026-33195 |
| Ubuntu:26.10 | rails | no fix listed | UBUNTU-CVE-2026-33195 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| rails | activestorage | >= 8.1.0.beta1, < 8.1.2.1>= 8.0.0.beta1, < 8.0.4.1< 7.2.3.1 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
References
- https://github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87 x_refsource_CONFIRM
- https://github.com/rails/rails/commit/4933c1e3b8c1bb04925d60347be9f69270392f2c x_refsource_MISC
- https://github.com/rails/rails/commit/9b06fbc0f504b8afe333f33d19548f3b85fbe655 x_refsource_MISC
- https://github.com/rails/rails/commit/a290c8a1ec189d793aa6d7f2570b6a763f675348 x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v7.2.3.1 x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v8.0.4.1 x_refsource_MISC
- https://github.com/rails/rails/releases/tag/v8.1.2.1 x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-33195 vdb-entry, x_refsource_REDHAT
- RHBZ#2450546 issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33195.json x_sadp-csaf-vex