CVE-2026-42258 (Medium) detected in net-imap-0.5.12.gem

Vulnerable Library - net-imap-0.5.12.gem

Ruby client api for Internet Message Access Protocol

Library home page: https://rubygems.org/gems/net-imap-0.5.12.gem

Sample Path to Dependency File: /Gemfile.lock

Path to vulnerable library: /vendor/cache/net-imap-0.5.12.gem

Dependency Hierarchy:

• openid_connect-1.4.2.gem (Root Library)
  • validate_email-0.1.6.gem
    • mail-2.8.1.gem
      • ❌ net-imap-0.5.12.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

Suggested Fix

Type: Upgrade version

Origin: https://github.com/ruby/net-imap/security/advisories/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