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CVE-2026-66066

Published Jul 30, 2026 CWE-1188

Overview

CVE-2026-66066 is a known-severity vulnerability. It was published on July 30, 2026.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHub github.com/rails/rails/commit/1c01bb587206ee6eb0e1179c2cef96a6a47acb1e GitHub github.com/rails/rails/commit/349e7a5d5b4b715af1e416db824f3c078a7d59e5 GitHub github.com/rails/rails/commit/d79b7f4aa17dec8ce4960fef05733c8c0c7ef49a GitHub github.com/rails/rails/releases/tag/v7.2.3.2 GitHub github.com/rails/rails/releases/tag/v8.0.5.1 GitHub github.com/rails/rails/releases/tag/v8.1.3.1 GitHub github.com/rails/rails/security/advisories/GHSA-xr9x-r78c-5hrm GitHub github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-66066.yml Ref thehackernews.com/2026/07/critical-rails-flaw-could-let.html Ref www.openwall.com/lists/oss-security/2026/07/29/9

Frequently Asked Questions

What is CVE-2026-66066?

CVE-2026-66066 is a known-severity vulnerability. It was published on July 30, 2026.

How severe is CVE-2026-66066?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-66066?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-66066?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-66066 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

How CyberStrike Helps

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HackBrowser

Browser-based exploitation validates findings with real proof-of-concept.
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