Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00016.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
ruby json affected
Version Status Constraints
>= 2.14.0, < 2.15.2.1 affected —
>= 2.16.0, < 2.17.1.2 affected —
>= 2.18.0, < 2.19.2 affected —

No data.

No data.

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Vendors Products
Ruby Subscribe
Json Subscribe

Project Subscriptions

Vendors Products
Ruby Subscribe
Json Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-3m6g-2423-7cp3 Ruby JSON has a format string injection vulnerability
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-33210 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-33210 cve-icon
History

Tue, 24 Mar 2026 02:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 23 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L'}

threat_severity

Moderate

Mon, 23 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Ruby
Ruby json
Vendors & Products Ruby
Ruby json

Sat, 21 Mar 2026 05:30:00 +0000

Type Values Removed Values Added
Description Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.
Title Ruby JSON has a format string injection vulnerability
Weaknesses CWE-134
References
Metrics cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-23T21:41:29.624Z

Reserved: 2026-03-17T23:23:58.313Z

Link: CVE-2026-33210

cve-icon Vulnrichment

Updated: 2026-03-23T21:01:59.265Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-20T23:16:46.010

Modified: 2026-03-23T14:32:02.800

Link: CVE-2026-33210

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-20T22:57:08Z

Links: CVE-2026-33210 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-23T09:51:58Z

Weaknesses