CVE-2026-47241: ruby net-imap

Vulnerability summary

CVE-2026-47241 is a low (CVSS 2.1) vulnerability in ruby net-imap. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.7% of scored vulnerabilities.

Timeline

1. 22-06-2026
   PublishedVulnerability first disclosed.
2. 23-06-2026
   Last modifiedVulnerability information updated.

Description

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 string argument which is only validated to prevent CRLF injection and then sent verbatim. If this string is derived from user-controlled input, an attacker can force the next command to be absorbed as a continuation of the first command. This will cause the first command to eventually fail, but also prevents it from returning until another command is sent (from another thread). That other command will not return until the connection is closed. This vulnerability is fixed in 0.6.5 and 0.5.15.

• CWE-162Improper Neutralization of Trailing Special ElementsThe product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes trailing special elements that could be interpreted in unexpected ways when they are sent to a downstream component.
• CWE-182Collapse of Data into Unsafe ValueThe product filters data in a way that causes it to be reduced or "collapsed" into an unsafe value that violates an expected security property.
• CWE-186Overly Restrictive Regular ExpressionA regular expression is overly restrictive, which prevents dangerous values from being detected.