- Action Pack hardened against open‑redirects, MIME‑parsing backtracking, HTTP token regex DoS, and unsafe polymorphic URL arguments (CVE‑2021‑22903, ‑22902, ‑22904, ‑22885).
- All other Rails components (Active Support, Active Model, Active Record, Action View, etc.) have no changes in this release.
6.1.3.2
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Active Storage disables libvips unfuzzed image loaders/savers, causing Vips::Error for BMP, ICO, PSD, SVG, JPEG XL, JPEG 2000, Netpbm and other formats – a breaking change for apps using those types
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