Description
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.
Published: 2022-12-24
Score: 7.1 High
EPSS: 46.5% Moderate
KEV: No
Impact: n/a
Action: n/a
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Remediation

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3665-1 node-json5 security update
Github GHSA Github GHSA GHSA-9c47-m6qq-7p4h Prototype Pollution in JSON5 via Parse Method
Ubuntu USN Ubuntu USN USN-6758-1 JSON5 vulnerability
History

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Fedoraproject Fedora
Json5 Json5
Redhat Logging Migration Toolkit Applications Openshift Data Foundation Openshift Devspaces Red Hat Single Sign On Rhmt Rhosemc
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2024-08-03T14:24:03.459Z

Reserved: 2022-11-28T00:00:00.000Z

Link: CVE-2022-46175

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-12-24T04:15:08.787

Modified: 2024-11-21T07:30:15.757

Link: CVE-2022-46175

cve-icon Redhat

Severity : Moderate

Publid Date: 2022-12-24T00:00:00Z

Links: CVE-2022-46175 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses