CVE-2026-33195

Summary

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 Software

Weaknesses

• CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

Rails: Active Storage: Active Storage (Rails): Arbitrary file access via path traversal in blob keys

Additional References

• https://access.redhat.com/security/cve/CVE-2026-33195
• https://bugzilla.redhat.com/show_bug.cgi?id=2450546
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33195.json

References

• 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

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