CVE-2026-33169 (Medium) detected in activesupport-7.2.2.2.gem

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
72/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
rails, ruby
Domain
backend, security

Research direction

Start with Gemfile.lock and vendor/cache/activesupport-7.2.2.2.gem, then inspect the dependency path through rubocop-rails. Update Active Support to a patched version supported by the project and refresh the locked or vendored dependency. Done means the vulnerable version is no longer present and dependency checks pass.

Written by the indexing model from the issue text.

Description

Mend: dependency security vulnerability

CVE-2026-33169 - Medium Severity Vulnerability

Vulnerable Library - activesupport-7.2.2.2.gem

A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich support for multibyte strings, internationalization, time zones, and testing.

Library home page: https://rubygems.org/gems/activesupport-7.2.2.2.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /vendor/cache/activesupport-7.2.2.2.gem

Dependency Hierarchy:

  • manageiq-style-1.5.9.gem (Root Library)
    • rubocop-rails-2.29.1.gem
      • ❌ activesupport-7.2.2.2.gem (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. "NumberToDelimitedConverter" uses a lookahead-based regular expression with "gsub!" to insert thousands delimiters. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, the interaction between the repeated lookahead group and "gsub!" can produce quadratic time complexity on long digit strings. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Publish Date: 2026-03-23

URL: CVE-2026-33169

CVSS 3 Score Details (5.3)

Base Score Metrics:

  • Exploitability Metrics:
    • Attack Vector: Network
    • Attack Complexity: Low
    • 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

Release Date: 2026-03-23

Fix Resolution: https://github.com/rails/rails.git - v8.0.4.1,https://github.com/rails/rails.git - v8.1.2.1,https://github.com/rails/rails.git - v7.2.3.1

Step up your Open Source Security Game with Mend here

Dominant language
Ruby
Stars
3
Forks
16
No merged PRs in 30d

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