CVE-2026-54696 (Low) detected in json-2.18.0.gem

Vulnerable Library - json-2.18.0.gem

This is a JSON implementation as a Ruby extension in C.

Library home page: https://rubygems.org/gems/json-2.18.0.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /vendor/cache/json-2.18.0.gem

Dependency Hierarchy:

• manageiq-style-1.5.9.gem (Root Library)
  • rubocop-rails-2.29.1.gem
    • rubocop-1.56.3.gem
      • ❌ json-2.18.0.gem (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Ruby JSON is a JSON implementation for Ruby. Versions 2.9.0 through 2.19.8 are vulnerable to heap buffer overflow when the JSON generator is provided with an oversized streamed object. When streaming to an IO JSON.dump(obj, io) and JSON::State#generate(obj, io) can write past the internal JSON generator buffer when a streamed object contains an
attacker-controlled string near 16 KB. Exploitation would result in a reliable process crash/denial of service. This issue has been fixed in version 2.19.9.

Publish Date: 2026-06-30

URL: CVE-2026-54696

CVSS 3 Score Details (3.7)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: High
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: Low

Suggested Fix

Type: Upgrade version

Origin: https://github.com/ruby/json/security/advisories/GHSA-x2f5-4prf-w687

Release Date: 2026-06-30

Fix Resolution: json - 2.19.9