CVE-2026-33210Ruby JSON is a JSON implementation for Ruby.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.1 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Weakness (CWE)
- CWE-134
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Aug 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ruby-lang json ruby-lang:json | from 2.14.0 before 2.15.2.1; from 2.16.0 before 2.17.1.2; from 2.18.0 before 2.19.2 | NVD |
References
- https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3mitigation, vendor-advisory
- https://access.redhat.com/errata/RHSA-2026:20596
- https://access.redhat.com/errata/RHSA-2026:20606
- https://access.redhat.com/errata/RHSA-2026:57565
- https://access.redhat.com/security/cve/CVE-2026-33210
- https://bugzilla.redhat.com/show_bug.cgi?id=2449871
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33210.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.