CVE-2026-33210
Ruby JSON has a format string injection vulnerability
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-134 |
| Vendor | ruby |
| Product | json |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 20, 2026 |
| Last Updated | Jul 21, 2026 |
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Affected Versions
ruby / json
>= 2.14.0, < 2.15.2.1 >= 2.16.0, < 2.17.1.2 >= 2.18.0, < 2.19.2
References
github.com: https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-33210 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2449871 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33210.json access.redhat.com: https://access.redhat.com/errata/RHSA-2026:20606 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:20596