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CVE-2026-33210 — Vulnerability in json — CVE Details

HIGH

Ruby JSON has a format string injection vulnerability

Published March 19, 2026Updated September 10, 2026Source: osv

Summary

### Impact A format string injection vulnerability than that 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 option isn't the default, if you didn't opt-in to use it, you are not impacted. ### Patches Patched in `2.19.2`. ### Workarounds The issue can be avoided by not using the `allow_duplicate_key: false` parsing option.

Advisory Timeline

  • First published March 19, 2026 (207 days ago).
  • Last revised September 10, 2026 — 175 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update json to 2.17.1.2 or later
gem install json -v 2.17.1.2
Bundler
Update json to 2.15.2.1 or later
gem install json -v 2.15.2.1
Bundler
Update json to 2.19.2 or later
gem install json -v 2.19.2

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (3)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
json
rubygems
2.16.0, 2.17.0, 2.17.12.17.1.2
json
rubygems
2.14.0, 2.14.1, 2.15.0, 2.15.1 (+1 more)2.15.2.1
json
rubygems
2.18.0, 2.18.1, 2.19.0, 2.19.12.19.2

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.6 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2026-33210?
Ruby JSON has a format string injection vulnerability This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.6/10).
How do I check if my project is affected by CVE-2026-33210?
CVE-2026-33210 affects json. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33210 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
7.6

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-3m6g-2423-7cp3

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