CVE-2026-42245 (Medium) detected in net-imap-0.5.12.gem

Nobody has claimed this yet.

## CVE-2026-42245 - Medium Severity Vulnerability
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
- :x: **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, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are crafted to exhaust the client's CPU for a denial of service attack. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Publish Date: 2026-05-09

URL: CVE-2026-42245

CVSS 3 Score Details (4.3)

Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- 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/net-imap/security/advisories/GHSA-q2mw-fvj9-vvcw

Release Date: 2026-05-05

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

***
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Start with Gemfile.lock and the cached gem at vendor/cache/net-imap-0.5.12.gem, then trace the dependency through mail and validate_email. Upgrade net-imap to the fixed 0.5.14 release and update the dependency metadata so the vulnerable 0.5.12 version is no longer present. Done means the lockfile and vendor cache resolve to a patched version.

Written by the indexing model from the issue text.