Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-xr9x-r78c-5hrm Active Storage has possible arbitrary file read and remote code execution in Active Storage variant processing
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 05 Aug 2026 14:30:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 01 Aug 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-434
References
Metrics threat_severity

None

cvssV3_1

{'score': 8.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:L'}

threat_severity

Important


Thu, 30 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Rails
Rails rails
Vendors & Products Rails
Rails rails

Thu, 30 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 30 Jul 2026 19:00:00 +0000

Type Values Removed Values Added
Description Action Pack is a framework for handling and responding to web requests. In versions prior to 7.2.3.2, 8.0.5.1 and 8.1.3.1, Active Storage does not disable libvips operations marked unsafe for untrusted content, allowing a crafted upload to invoke such an operation. Consuming applications are affected when configured to use libvips and accept image uploads from untrusted users. An unauthenticated attacker may exploit this behavior to read arbitrary files accessible to the Rails process, including environment variables and application secrets. Exposure of credentials such as secret_key_base or external-service tokens may enable remote code execution or lateral movement. This issue has been fixed in versions 7.2.3.2, 8.0.5.1 and 8.1.3.1.
Title Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
Weaknesses CWE-1188
References
Metrics cvssV4_0

{'score': 9.5, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-05T13:46:21.375Z

Reserved: 2026-07-23T23:25:28.897Z

Link: CVE-2026-66066

cve-icon Vulnrichment

Updated: 2026-08-01T06:50:02.396Z

cve-icon NVD

Status : Received

Published: 2026-07-30T19:18:35.843

Modified: 2026-08-05T15:17:03.507

Link: CVE-2026-66066

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-30T18:32:11Z

Links: CVE-2026-66066 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T05:15:15Z

Weaknesses