GitHub Advisoryadvisory · RubyGems

GHSA-9xrj-h377-fr87 Rails Active Storage has possible Path Traversal in DiskService

HIGH Published 2026-03-23 Modified 2026-05-13 Official page ↗
Aliases
CVE-2026-33195
Ecosystem
RubyGems
Packages
activestorage
Severity
High
CVSS vector
CVSS: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:U
Weaknesses
CWE-22
Reviewed
2026-03-23

Affected packages

• RubyGems activestorage: >= 8.1.0.beta1, < 8.1.2.1 → fixed in 8.1.2.1 • RubyGems activestorage: >= 8.0.0.beta1, < 8.0.4.1 → fixed in 8.0.4.1 • RubyGems activestorage: < 7.2.3.1 → fixed in 7.2.3.1

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. Credit This issue was responsibly reported by Hackerone researcher ksw9722.

Related

Alias · CVE (1)

  • CVE-2026-33195 Active Storage allows users to attach cloud and local files in Rails applications. vulnerability

Weakness · CWE (1)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References