Ruby JSON 2.14.0-2.15.2.1 Format String Injection (allow_duplicate_key: false)
CVE-2026-33210 Published on March 20, 2026

Ruby JSON has a format string injection vulnerability
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.

NVD

Vulnerability Analysis

CVE-2026-33210 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

Use of Externally-Controlled Format String

The software uses a function that accepts a format string as an argument, but the format string originates from an external source.


Products Associated with CVE-2026-33210

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Red Hat Enterprise Linux (RHEL)
 
Red Hat Logging
 
Red Hat 3scale Amp
 
Red Hat Amq Clients
 
Red Hat Enterprise Linux Ai
 

Affected Versions

ruby json: Red Hat Enterprise Linux AppStream (v. 10): Red Hat Enterprise Linux AppStream (v. 9): Red Hat Enterprise Linux CodeReady Linux Builder (v. 10): Red Hat Enterprise Linux 10: Logging Subsystem for Red Hat OpenShift: Red Hat 3scale API Management Platform 2: Red Hat AMQ Clients: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux AI (RHEL AI) 3:

Exploit Probability

EPSS
0.55%
Percentile
41.43%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.