Vulnerability Database · RubyGems · json · Version
json 1.2.1
1.2.1 is affected by 2 vulnerabilities.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to. The upgrade Vulert recommends: 3.1.0.
Critical 0 High 2 Medium 0 Low 0 Unrated 0
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Released 26 Feb 2010
Licence Ruby
Also known from other sources 0
Newer releases 137
Database updated 23/Oct/2026
Release and licence data published by RubyGems. Licence information is not legal advice.
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01 Vulnerabilities affecting this version
json 1.2.1 vulnerabilities
2 vulnerabilities cover json 1.2.1. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| CVE-2020-10663: Unsafe object creation in json RubyGem | 7.5 high | 2.3.0 | 27 Jul 2020 |
| CVE-2013-0269: JSON gem Improper Input Validation vulnerability | N/A high | 1.5.5 | 24 Oct 2017 |
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Questions
About json 1.2.1
Is json 1.2.1 vulnerable?
Yes. 2 vulnerabilities in the Vulert database cover json 1.2.1: 0 critical, 2 high, 0 medium and 0 low. The upgrade Vulert recommends is 3.1.0, and each entry above names the fixed version to move to.
Which version of json should I use instead of 1.2.1?
3.1.0 is the version Vulert recommends for this release line. The version table on the package page lists every release with the vulnerabilities recorded against it.
Is 1.2.1 the latest release of json?
No. 1.2.1 was published 26 Feb 2010, and newer releases exist. Newer is not automatically safer — the version table on the package page shows what each release carries.
How do I monitor json for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the json version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.