CVE-2026-33210

CRITICAL

9.1

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.

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/20/2026

Last Modified3/27/2026

Sourcenvd

Honeypot Sightings0

Affected Products

ruby-lang:json

Weaknesses (CWE)

CWE-134

References

https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3(security-advisories@github.com)

IOC Correlations

No correlations recorded

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