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Dancer-1.3522
⭐ Starred 738 / Dancer::Request::Upload
Security Advisories (1)
CVE-2026-5080 (2026-04-30)

Dancer::Session::Abstract versions through 1.3522 for Perl generates session ids insecurely. The session id is generated from summing the character codepoints of the absolute pathname with the process id, the epoch time and calls to the built-in rand() function to return a number between 0 and 999-billion, and concatenating that result three times. The path name might be known or guessed by an attacker, especially for applications known to be written using Dancer with standard installation locations. The epoch time can be guessed by an attacker, and may be leaked in the HTTP header. The process id comes from a small set of numbers, and workers may have sequential process ids. The built-in rand() function is seeded with 32-bits and is considered unsuitable for security applications. Predictable session ids could allow an attacker to gain access to systems.

NAME

Dancer::Request::Upload - class representing file uploads requests

VERSION

version 1.3522

SYNOPSIS

 # somewhere in your view:
 <form action="/upload" method="POST" enctype="multipart/form-data">
   <input type="file" name="filename">
   <input type="submit">
 </form>

 # and then in your application handler:
 post '/upload' => sub {
   my $file = request->upload('filename');
   $file->copy_to($upload_dir);  # or whatever you need
 };

DESCRIPTION

This class implements a representation of file uploads for Dancer. These objects are accessible within route handlers via the request->uploads keyword. See Dancer::Request for details.

METHODS

filename

Returns the filename as sent by the client.

basename

Returns basename for "filename".

tempname

Returns the name of the temporary file the data has been saved to.

This will be in e.g. /tmp, and given a random name, with no file extension.

Creates a hard link to the temporary file. Returns true for success, false for failure.

$upload->link_to('/path/to/target');
file_handle

Returns a read-only file handle on the temporary file.

content

Returns a scalar containing the contents of the temporary file.

copy_to

Copies the temporary file using File::Copy. Returns true for success, false for failure.

$upload->copy_to('/path/to/target')
size

The size of the upload, in bytes.

headers

Returns a hash ref of the headers associated with this upload.

type

The Content-Type of this upload.

AUTHORS

This module as been written by Alexis Sukrieh, heavily based on Plack::Request::Upload. Kudos to Plack authors.

SEE ALSO

Dancer

AUTHOR

Dancer Core Developers

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.