CVE-2026-33210
Critical
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.
SeverityCritical
CVSS9.1
Exploit probability—
ProductRuby-lang Json
PublishedMar 20, 2026
First seenMar 20, 2026
Weakness typeCWE-134CWE-134
How to fix
Update
- ruby-lang json2.15.2.1, 2.17.1.2, 2.19.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ruby-lang json | 2.14.0 ≤ v < 2.15.2.1, 2.16.0 ≤ v < 2.17.1.2, 2.18.0 ≤ v < 2.19.2 | 2.15.2.1, 2.17.1.2, 2.19.2 |
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