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Dancer-1.1804
⭐ Starred 738 / Dancer::Headers
Security Advisories (3)
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.

CVE-2012-5572 (2014-05-30)

CRLF injection vulnerability in the cookie method allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via a cookie name.

CVE-2011-1589 (2011-04-05)

Directory traversal vulnerability (Mojolicious report, but Dancer was vulnerable as well).

NAME

Dancer::Headers - Wrapper to handle request headers

SYNOPSYS

use Dancer::Headers;

# $headers may be either an ARRAY of key-value pairs, or 
# an HTTP::Headers object.
$dh = Dancer::Headers->new(headers => $headers);

# $dh is now a normalized object, which lets the user do:
# $dh->get('Some-Header');

DESCRIPTION

This class implements a wrapper that can provide a common interface to access headers, no matter what their origin is.

When the Dancer application is ran under Plack, the headers are accessed via Plack::Request, which returns a HTTP::Headers object. When under the standalone server (powered by HTTP::Server::Simple::PSGI, the headers are sent as an array.

Dancer::Headers takes care of normalizing those two kind of data structure into a singe object.

METHODS

get($header)

Returns the value of the given $header.

ARRAY references are stored for headers with multiple values. When get is called in a scalar context on such entries, it returns the first value stored, if called in list context, it returns all the values.

$headers = Dancer::Headers->new([foo => 1, foo => 2]);
my $first = $headers->get('foo'); # 1
my @all   = $headers->get('foo'); # (1, 2)

get_all()

Returns the whole normalized HASH reference.

AUTHORS

This module as been writen by Alexis Sukrieh

SEE ALSO

Dancer