CVE-2026-47240 - Medium Severity Vulnerability
Vulnerable Library - net-imap-0.6.4.gem
Ruby client api for Internet Message Access Protocol
Library home page: https://rubygems.org/gems/net-imap-0.6.4.gem
Sample Path to Dependency File: /Gemfile.lock
Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/net-imap-0.6.4.gem
Dependency Hierarchy:
- rails-8.0.5.gem (Root Library)
- actionmailer-8.0.5.gem
- mail-2.9.0.gem
- ❌ net-imap-0.6.4.gem (Vulnerable Library)
Found in base branch: master
Vulnerability Details
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.
Publish Date: 2026-06-22
URL: CVE-2026-47240
CVSS 3 Score Details (6.1)
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Local
- Attack Complexity: Low
- 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
Release Date: 2026-06-11
Fix Resolution: https://github.com/ruby/net-imap.git - 0.5.15,net-imap - 0.6.4.1,net-imap - 0.5.15
Step up your Open Source Security Game with Mend here
CVE-2026-47240 - Medium Severity Vulnerability
Ruby client api for Internet Message Access Protocol
Library home page: https://rubygems.org/gems/net-imap-0.6.4.gem
Sample Path to Dependency File: /Gemfile.lock
Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/net-imap-0.6.4.gem
Dependency Hierarchy:
Found in base branch: master
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.
Publish Date: 2026-06-22
URL: CVE-2026-47240
Base Score Metrics:
- Exploitability Metrics:
- Attack Vector: Local
- Attack Complexity: Low
- 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.Type: Upgrade version
Release Date: 2026-06-11
Fix Resolution: https://github.com/ruby/net-imap.git - 0.5.15,net-imap - 0.6.4.1,net-imap - 0.5.15
Step up your Open Source Security Game with Mend here