Rails Active Storage has possible Path Traversal in DiskService

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Summary

CVECVE-2026-33195
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-24 00:16:28 UTC
Updated2026-06-30 03:18:37 UTC
DescriptionActive 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.

Risk And Classification

Primary CVSS: v4.0 8 HIGH from [email protected]

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8HIGHCVSS: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/C...
4.0CNADECLARED8HIGHCVSS: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
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1ADPCVSS8.1HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Rubyonrails Rails All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rails Activestorage affected >= 8.1.0.beta1, < 8.1.2.1 Not specified
CNA Rails Activestorage affected >= 8.0.0.beta1, < 8.0.4.1 Not specified
CNA Rails Activestorage affected < 7.2.3.1 Not specified
ADP Red Hat Red Hat 3scale API Management Platform 2 Not specified Not specified

References

ReferenceSourceLinkTags
github.com/rails/rails/commit/a290c8a1ec189d793aa6d7f2570b6a763f675348 [email protected] github.com Patch
access.redhat.com/security/cve/CVE-2026-33195 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
github.com/rails/rails/commit/4933c1e3b8c1bb04925d60347be9f69270392f2c [email protected] github.com Patch
github.com/rails/rails/commit/9b06fbc0f504b8afe333f33d19548f3b85fbe655 [email protected] github.com Patch
github.com/rails/rails/security/advisories/GHSA-9xrj-h377-fr87 [email protected] github.com Vendor Advisory
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33195.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
github.com/rails/rails/releases/tag/v7.2.3.1 [email protected] github.com Release Notes
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
github.com/rails/rails/releases/tag/v8.0.4.1 [email protected] github.com Release Notes
github.com/rails/rails/releases/tag/v8.1.2.1 [email protected] github.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-03-24T00:01:50.330ZReported to Red Hat.
ADP2026-03-23T23:31:41.785ZMade public.

Workarounds

ADP: To mitigate this issue, ensure that blob keys used by Active Storage are not derived from untrusted user input. Applications should validate and sanitize any user-provided data before it is used in blob keys to prevent path traversal sequences.

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