CVE-2026-33210

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 v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:ruby-lang:json::::::ruby::*
	cpe:2.3:a:ruby-lang:json::::::ruby::*
	cpe:2.3:a:ruby-lang:json::::::ruby::*

History

27 Mar 2026, 21:25

Type	Values Removed	Values Added
First Time		Ruby-lang json Ruby-lang
CPE		cpe:2.3:a:ruby-lang:json::::::ruby::*
References	~~() https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 -~~	() https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 - Mitigation, Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.1
Summary		(es) Ruby JSON es una implementación de JSON para Ruby. Desde la versión 2.14.0 hasta antes de las versiones 2.15.2.1, 2.17.1.2 y 2.19.2, una vulnerabilidad de inyección de cadena de formato puede llevar a ataques de denegación de servicio o revelación de información, cuando la opción de análisis allow_duplicate_key: false se utiliza para analizar documentos proporcionados por el usuario. Este problema ha sido parcheado en las versiones 2.15.2.1, 2.17.1.2 y 2.19.2.

20 Mar 2026, 23:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-20 23:16

Updated : 2026-03-27 21:25

NVD link : CVE-2026-33210

Mitre link : CVE-2026-33210

CVE.ORG link : CVE-2026-33210

JSON object : View

Products Affected

ruby-lang

json

CWE

CWE-134

Use of Externally-Controlled Format String

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