CVE-2026-47242
MediumCVSS 5.8Exploitation Probability (EPSS)
Low risk3th percentile — higher than 3% of all known CVEs
Summary
The Net::IMAP library in Ruby has a vulnerability that allows arbitrary IMAP command injection due to improper validation of arguments in the #id and #enable methods. This issue affects versions prior to 0.6.5 and 0.5.15.
Risk Assessment
An attacker could exploit this vulnerability to execute unauthorized IMAP commands, potentially compromising data integrity and system security.
Recommendation
It is recommended to update the Net::IMAP library to version 0.6.5 or 0.5.15 to mitigate this vulnerability.
Original NVD description (English source)
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.