Vulnerability Description
Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF sequences. While Net::IMAP#enable does process its arguments for aliases, it does not validate them as valid atoms (or as a list of valid atoms). The #to_s value is sent verbatim. Arguments to either command could be used by an attacker to inject arbitrary IMAP commands. This vulnerability is fixed in 0.6.5 and 0.5.15.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-47242?
CVE-2026-47242 is a documented vulnerability. Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value stri...
How severe is CVE-2026-47242?
CVSS scoring is not yet available for CVE-2026-47242. Check NVD for updates.
Is there a patch for CVE-2026-47242?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.