CVE-2026-66066
Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
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.
Coverage 1 source
-
2026-08-03
Help Net Security
critical
KindaRails2Shell threatens Ruby on Rails apps (CVE-2026-66066)
CVE-2026-66066 in Ruby on Rails allows attackers to read sensitive files and potentially take control of a server.
Also covered
- CVE-2026-86950 Apple iOS and iPadOS
- CVE-2023-6548 Cloud Software Group NetScaler ADC
- CVE-2023-25608 Fortinet FortiAP-W2
- CVE-2026-88772 Memory overflow vulnerability leading to Remote Code Execution or Denial of Service
- CVE-2026-88771 A remote code execution vulnerability exists due to improper input validation, which can allow an unauthenticated attacker to execute arbitrary commands