Action Pack: Possible arbitrary file read and remote code execution in Active Storage variant processing
nvd · CVSS 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XModerate · next 30 days
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
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.
modules/exploits/multi/http/rails_activestorage_vips_rce.rb
CVE-2026-66066
Single-file PoC for Rails CVE-2026-66066: arbitrary file read, secret recovery, threaded scanning, and conditional RCE via signed image variations.
CVE-2026-66066 (KindaRails2Shell) PoC - Rails Active Storage/libvips arbitrary file read to RCE; for authorized security testing
CVE-2026-66066 — KindaRails2Shell: Rails Active Storage/libvips Arbitrary File Read → RCE. MATLAB/HDF5 dual-identity file → SECRET_KEY_BASE theft → forged variation. CVSS 9.5 | Rails < 8.1.3.1
PoC for CVE-2026-66066 in Ruby on Rails
Python proof-of-concept for CVE-2026-66066, demonstrating the vulnerability and providing a reproducible exploit for security research and validation.
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