<%= image_tag blob.variant(params[:t] => params[:v]) %>
Where the transformation method or its arguments are untrusted arbitrary input.
All users running an affected release should either upgrade or use one of the workarounds immediately.
Workarounds
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Consuming user supplied input for image transformation methods or their parameters is unsupported behavior and should be considered dangerous.
Strict validation of user supplied methods and parameters should be performed
as well as having a strong ImageMagick security
policy deployed.
Credits
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Thank you lio346 for reporting this!