Rapid7 Analysis: KindaRails2Shell (CVE-2026-66066)

Overview On July 29, 2026, the Ruby on Rails project published a security advisory for CVE-2026-66066, an arbitrary file read in Active Storage applications that use the Vips image processor with untrusted uploads. The affected Active Storage ranges are = 8.0, = 8.1, 8.1.3.1. Vips is the default...

Ruby on Rails Active Storage Vips Arbitrary File Read and Remote Code Execution

This module exploits CVE-2026-66066 in Ruby on Rails Active Storage when the application uses the Vips variant processor and accepts untrusted image uploads. A crafted MATLAB v7.3/HDF5 image uses external storage to read text files accessible to the Rails worker through a PNG representation...