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CVE-2026-33195 is a path traversal vulnerability in Ruby on Rails Active Storage affecting versions prior to 8.1.2.1, 8.0.4.1, and 7.2.3.1. The flaw is in Active Storage's DiskService#path_for, which failed to validate that a resolved filesystem path remained داخل the configured storage root directory. When an application allows attacker-controlled input to be used as an Active Storage blob key, path traversal sequences such as dot segments can cause file operations to resolve outside the intended storage area. Depending on the exposed application behavior, this can permit arbitrary file read, write, or deletion on the server. The issue is primarily relevant to nonstandard implementations, such as custom direct upload flows or manual Blob creation paths that let clients specify blob keys, because typical Rails deployments generate trusted random blob keys automatically. The patch causes DiskService#path_for to reject invalid keys, including dot segments and paths resolving outside the storage root, by raising InvalidKeyError.
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