CVE-2026-33210 HIGH

CVE-2026-33210: Ruby JSON has a format string injection vulnerability

Vendor Ruby
Product json
Weakness CWE-134
Published March 20, 2026
Last update June 30, 2026
View on NVD All CVEs

CVSS base score

8.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 20, 2026 CVE published
June 30, 2026 Record updated