Remote property pollution via __proto__ key
Published Nov 3, 2022 · Updated Dec 3, 2025
Prototype pollution in deep-parse-json 1.0.2 allows remote attackers to alter object properties via crafted JSON keys. The recursive parser accepts the proto key without validation, allowing attacker-supplied properties to modify the parsed object's prototype. Exploitation requires an application to process attacker-controlled JSON with this library; the documented impact is integrity modification of object properties.
Summary
What happened
Prototype pollution in deep-parse-json 1.0.2 allows remote attackers to alter object properties via crafted JSON keys. The recursive parser accepts the proto key without validation, allowing attacker-supplied properties to modify the parsed object's prototype. Exploitation requires an application to process attacker-controlled JSON with this library; the documented impact is integrity modification of object properties.
The record
- CVE
- CVE-2022-42743
- Published
- Nov 3, 2022
- Updated
- Dec 3, 2025
- Vendor
- deep-parse-json Project
- Product
- deep-parse-json
- Classifications
- CWE-1321
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Nov 3, 2022CVE publishedPublication date reported by the CVE source.
- Dec 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.0.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Fluid Attacks exploit.js prototype-pollution demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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