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Dancer-1.1902 UNAUTHORIZED RELEASE
⭐ Starred 738 / Dancer::Serializer::JSON
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::Serializer::JSON - serializer for handling JSON data

SYNOPSIS

DESCRIPTION

This class is an interface between Dancer's serializer engine abstraction layer and the JSON module.

In order to use this engine, use the template setting:

serializer: JSON

This can be done in your config.yml file or directly in your app code with the set keyword. This serializer will also be used when the serializer is set to mutable and the correct Accept headers are supplied.

The JSON module has 2 configuration variables that can be useful when working with ORM's like DBIx::Class: allow_blessed and convert_blessed. Please consult the JSON documentation for more information. You can add extra settings to the engines configuration to turn these on.

engines:
    JSON:
        allow_blessed: '1'
        convert_blessed: '1'

METHODS

serialize

Serialize a data structure to a JSON structure.

deserialize

Deserialize a JSON structure to a data structure

content_type

Return 'application/json'