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CVE-2026-54696 (Low) detected in json-2.12.2.gem

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
68/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Quiet
Tech stack
ruby
Domain
security

Research direction

Start with Gemfile.lock and the vendored dependency at vendor/cache/json-2.12.2.gem, then check how this repository manages Ruby gem upgrades. Update json to the stated fixed version, 2.19.9, refresh the lockfile and vendored package as needed, and run the repository's test suite to confirm the dependency change is clean.

Written by the indexing model from the issue text.

Description

Mend: dependency security vulnerability

CVE-2026-54696 - Low Severity Vulnerability

Vulnerable Library - json-2.12.2.gem

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

Library home page: https://rubygems.org/gems/json-2.12.2.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /vendor/cache/json-2.12.2.gem

Dependency Hierarchy:

  • rubocop-1.76.1.gem (Root Library)
    • ❌ json-2.12.2.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

For more information on CVSS3 Scores, click here.

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

Step up your Open Source Security Game with Mend here

Dominant language
Ruby
Stars
30
Forks
27
No merged PRs in 30d

Getting set up

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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