Bug 2450546 (CVE-2026-33195)

Summary: CVE-2026-33195 Rails: Active Storage: Active Storage (Rails): Arbitrary file access via path traversal in blob keys
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akostadi, amasferr, dmayorov, jlledo, jvasik, kaycoth, pantinor, rblanco, tsedmik, vmugicag
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Active Storage, a component of Rails applications that manages file attachments. This vulnerability allows an attacker to manipulate file paths by using specially crafted input in blob keys. This manipulation can lead to unauthorized reading, writing, or deletion of arbitrary files on the server, potentially compromising the integrity and confidentiality of data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-03-24 00:02:14 UTC 
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.