CVE-2026-33210

Ruby JSON has a format string injection vulnerability

Published: Mar 20, 2026Updated: Aug 21, 2026 Sources: CVE List NVDCWE-134

9.1CRITICAL

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:NIntegrity

None

A:HAvailability

High

Open in CVSS calculator →

Weaknesses

CWE-134

Affected Products

ruby-lang

oss-projectaka ruby, rexml

jsonLibraryLibrary

OSS Libraries / rubygems

ruby

oss-project·JP

jsonLibrary

OSS Libraries / rubygems

Exploitability

Workaround Available

Is your org exposed to CVE-2026-33210?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

1 technique

Execution

View detailed technique mapping

References

https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3

github.com

https://access.redhat.com/errata/RHSA-2026:20596

access.redhat.com

https://access.redhat.com/errata/RHSA-2026:20606

access.redhat.com

and 4 more references View all →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-33210 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows