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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.

PUBLISHED Reserved 2026-03-17 | Published 2026-03-20 | Updated 2026-03-23 | Assigner GitHub_M




HIGH: 8.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-134: Use of Externally-Controlled Format String

Product status

>= 2.14.0, < 2.15.2.1
affected

>= 2.16.0, < 2.17.1.2
affected

>= 2.18.0, < 2.19.2
affected

References

github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3

cve.org (CVE-2026-33210)

nvd.nist.gov (CVE-2026-33210)

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