CVE-2022-46175

HIGH

json5 <1.0.2 and >=2.0.0 <2.2.2 - Prototype Pollution via __proto__ Key Parsing

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2022-46175. PoCs published by giz-berlin.

AI-analyzed exploit summary The repository appears to be a Quasar framework project stub with no exploit code or PoC for CVE-2022-46175. It contains standard configuration files (ESLint, PostCSS, Babel, Quasar) and no offensive techniques or vulnerability demonstrations.

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.

Exploits (1)

nomisec STUB
by giz-berlin · poc
https://github.com/giz-berlin/quasar-app-webpack-json5-vulnerability

The repository appears to be a Quasar framework project stub with no exploit code or PoC for CVE-2022-46175. It contains standard configuration files (ESLint, PostCSS, Babel, Quasar) and no offensive techniques or vulnerability demonstrations.

Classification
Stub 90%
Attack Type
Other
Complexity
Trivial
Reliability
Theoretical
Target: Quasar framework (version unspecified)
No auth needed
Prerequisites: None identified
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (6)

Core 6

Scores

CVSS v3 7.1
EPSS 0.4230
EPSS Percentile 97.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:H

Details

CWE
CWE-1321
Status published
Products (3)
fedoraproject/fedora 37
json5/json5 < 1.0.2
npm/json5 2.0.0 - 2.2.2npm
Published Dec 24, 2022
Tracked Since Feb 18, 2026