Rails Active Storage has possible Path Traversal in DiskService
Published: March 23, 2026
SECURITY IDENTIFIERS
- CVE: CVE-2026-33195 (NVD)
- GHSA: GHSA-9xrj-h377-fr87
- Vendor Advisory: https://github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87
GEM
FRAMEWORK
PATCHED VERSIONS
~> 7.2.3, >= 7.2.3.1
~> 8.0.4, >= 8.0.4.1
>= 8.1.2.1
DESCRIPTION
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.
RELATED
- 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://github.com/advisories/GHSA-9xrj-h377-fr87