CVE-2026-33210Ruby JSON has a format string injection vulnerability
Updated under an hour ago ()
Does this affect you?
It affects ruby json and 7 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- 8.3 HIGH (v4.0, CNA)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
- 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
- GitHub_M
- NVD analysis
- Modified
- Record last updated
- Aug 21, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
ruby json ruby:json (from the name) | from 2.14.0, < 2.15.2.1; from 2.16.0, < 2.17.1.2; from 2.18.0, < 2.19.2 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:4.0.3-34.el10_2 not affected | CISA ADP |
Red Hat Red Hat Hardened Images redhat:hummingbird | from 4.0.6-37.2.hum1 not affected | CISA ADP |
Red Hat Logging Subsystem for Red Hat OpenShift redhat:logging | 5 | CISA ADP |
Red Hat Red Hat 3scale API Management Platform 2 redhat:red_hat_3scale_amp | 2 | CISA ADP |
Red Hat Red Hat AMQ Clients redhat:amq_clients | 2023 | CISA ADP |
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 redhat:enterprise_linux_ai | 3 | CISA ADP |
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-2423-7cp3x-refsource-confirm, mitigation, 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.