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JSON5 is an extension to the popular JSON file format that aims to be easier to write and maintain by hand (e.g. for config files). The parse method of the JSON5 library before and including versions 1.0.1 and 2.2.1 does not restrict parsing of keys named __proto__, allowing specially crafted strings to pollute the prototype of the resulting object. This vulnerability pollutes the prototype of the object returned by JSON5.parse and not the global Object prototype, which is the commonly understood definition of Prototype Pollution. However, polluting the prototype of a single object can have significant security impact for an application if the object is later used in trusted operations. This vulnerability could allow an attacker to set arbitrary and unexpected keys on the object returned from JSON5.parse. The actual impact will depend on how applications utilize the returned object and how they filter unwanted keys, but could include denial of service, cross-site scripting, elevation of privilege, and in extreme cases, remote code execution. JSON5.parse should restrict parsing of __proto__ keys when parsing JSON strings to objects. As a point of reference, the JSON.parse method included in JavaScript ignores __proto__ keys. Simply changing JSON5.parse to JSON.parse in the examples above mitigates this vulnerability. This vulnerability is patched in json5 versions 1.0.2, 2.2.2, and later.
CVE-2022-46175 - High Severity Vulnerability
JSON for humans.
Library home page: https://registry.npmjs.org/json5/-/json5-2.2.0.tgz
Path to dependency file: /package.json
Path to vulnerable library: /node_modules/json5/package.json
Dependency Hierarchy:
Found in HEAD commit: 48fc7fad8db984ea4b51ff5d437105010d767165
Found in base branch: master
JSON5 is an extension to the popular JSON file format that aims to be easier to write and maintain by hand (e.g. for config files). The
parse
method of the JSON5 library before and including versions 1.0.1 and 2.2.1 does not restrict parsing of keys named__proto__
, allowing specially crafted strings to pollute the prototype of the resulting object. This vulnerability pollutes the prototype of the object returned byJSON5.parse
and not the global Object prototype, which is the commonly understood definition of Prototype Pollution. However, polluting the prototype of a single object can have significant security impact for an application if the object is later used in trusted operations. This vulnerability could allow an attacker to set arbitrary and unexpected keys on the object returned fromJSON5.parse
. The actual impact will depend on how applications utilize the returned object and how they filter unwanted keys, but could include denial of service, cross-site scripting, elevation of privilege, and in extreme cases, remote code execution.JSON5.parse
should restrict parsing of__proto__
keys when parsing JSON strings to objects. As a point of reference, theJSON.parse
method included in JavaScript ignores__proto__
keys. Simply changingJSON5.parse
toJSON.parse
in the examples above mitigates this vulnerability. This vulnerability is patched in json5 versions 1.0.2, 2.2.2, and later.Publish Date: 2022-12-24
URL: CVE-2022-46175
Base Score Metrics:
Type: Upgrade version
Origin: https://www.cve.org/CVERecord?id=CVE-2022-46175
Release Date: 2022-12-24
Fix Resolution (json5): 2.2.2
Direct dependency fix Resolution (@babel/core): 7.13.13
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