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.

Researchers disclosed "KindaRails2Shell" a remote code execution in Ruby on Rails Active Storage. No PoC yet but we're monitoring. Upgrade Rails and libvips ASAP.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-66066)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-66066)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
445492	SCA: security update for activestorage (GHSA-xr9x-r78c-5hrm)	Tenable Cloud Security	SCA Checks	critical
445492	SCA: security update for activestorage (GHSA-xr9x-r78c-5hrm)	Tenable Self-Hosted Container Security	SCA Checks	critical
331117	Linux Distros Unpatched Vulnerability : CVE-2026-66066	Nessus	Misc.	critical

Detections

Analytics

CVE-2026-66066

critical

Tenable Plugins

critical

critical

critical