CVE-2026-66066

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.

• CWE-1188

• https://github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e
• https://github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5
• https://github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a
• https://github.com/rails/rails/releases/tag/v7.2.3.2
• https://github.com/rails/rails/releases/tag/v8.0.5.1
• https://github.com/rails/rails/releases/tag/v8.1.3.1
• https://github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml
• https://thehackernews.com/2026/07/critical-rails-flaw-could-let.html
• https://www.openwall.com/lists/oss-security/2026/07/29/9
• https://www.openwall.com/lists/oss-security/2026/08/01/6
• https://ethiack.com/info-hub/research/kindarails2shell-rails-rce-cve-2026-66066
• https://github.com/rails/rails-forensics-CVE-2026-66066

Published

Jul 30, 2026

Last Modified

Sep 10, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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