CVE-2026-42258 (Medium) detected in net-imap-0.6.3.gem

[mend-bolt-for-github]

CVE-2026-42258 - Medium Severity Vulnerability

Vulnerable Library - net-imap-0.6.3.gem

Ruby client api for Internet Message Access Protocol

Library home page: https://rubygems.org/gems/net-imap-0.6.3.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/net-imap-0.6.3.gem

Dependency Hierarchy:

• gettext_i18n_rails_js-1.3.1.gem (Root Library)
  • rails-8.0.4.gem
    • actionmailer-8.0.4.gem
      • mail-2.9.0.gem
        • ❌ net-imap-0.6.3.gem (Vulnerable Library)

Found in base branch: master

Vulnerability Details

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, symbol arguments to commands are vulnerable to a CRLF Injection / IMAP Command injection via Symbol arguments passed to IMAP commands. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Publish Date: 2026-05-09

URL: CVE-2026-42258

CVSS 3 Score Details (5.3)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-75xq-5h9v-w6px

Release Date: 2026-05-05

Fix Resolution: net-imap - 0.4.24,https://github.com/ruby/net-imap.git - v0.4.24,https://github.com/ruby/net-imap.git - v0.6.4,net-imap - 0.6.4,net-imap - 0.5.14,https://github.com/ruby/net-imap.git - v0.5.14

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