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Vulnerability record · CVE-2026-33210 · published 20 March 2026

CVE-2026-33210: Ruby-lang json vulnerability

Ruby Lang · Json

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.

8.3 CVSS 4.0 High EPSS 1.0% · top 38.4% CWE-134 · CWE-134
8.3CVSS 4.0 base score
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
21 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 MitigationVendor 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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-33210), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.