CVE-2026-33210
Ruby JSON has a format string injection vulnerability
9.1
CRITICAL
CVSS 3.1
EPSS 0.04%
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.
How to fix CVE-2026-33210
To remediate CVE-2026-33210, upgrade the affected package to a fixed version below.
- —upgrade to 2.19.2+dfsg-1 or later
- —upgrade to 2.19.2 or later
Is CVE-2026-33210 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 2.19.2+dfsg-1
- >= 2.18.0, < 2.19.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | 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 |
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |