CVE-2026-33210
Ruby JSON has a format string injection vulnerability
- State
- Published
- Severity
- 8.3 High
- Published
- Mar 20, 2026
- Updated
- Aug 21, 2026
- Reserved
- Mar 17, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | 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 | GitHub_M |
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H | redhat-SADP |
Weaknesses
- CWE-134 Use of Externally-Controlled Format String
Affected Products
| Product | Versions |
|---|---|
jsonruby |
|
References
- https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3
- https://access.redhat.com/security/cve/CVE-2026-33210vdb-entry
- RHBZ#2449871issue-tracking
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33210.json
- https://access.redhat.com/errata/RHSA-2026:20606vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:20596vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:57565vendor-advisory
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