CVE-2026-33210: Ruby JSON has a format string injection vulnerability

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 vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

High

Integrity

None

Availability

High

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.9% · higher than 59% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

JS

json · ruby

>= 2.14.0, < 2.15.2.1; >= 2.16.0, < 2.17.1.2; >= 2.18.0, < 2.19.2 · source: vendor, NVD

RH

Red Hat Enterprise Linux 10 · Red Hat

All versions, or not specified · source: CISA

RH

Red Hat Enterprise Linux 9 · Red Hat

All versions, or not specified · source: CISA

RH

Red Hat Hardened Images · Red Hat

All versions, or not specified · source: CISA