CVE-2026-47241: low-severity vulnerability in ruby net-imap
Net::IMAP: Denial of Service via incomplete raw argument validation
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 2.1epss 0.4%
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected products
ruby · net-imapRelated CVEs — ruby net-imap
In the same product, most dangerous first.
CVE-2026-47240MEDIUMNet::IMAP: Command Injection via non-synchronizing literal in "raw" argumentEPSS 0.8%CVE-2026-42258MEDIUMnet-imap: Command Injection via unvalidated Symbol inputsEPSS 0.8%CVE-2025-25186MEDIUMNet::IMAP vulnerable to possible DoS by memory exhaustionEPSS 0.6%CVE-2025-43857MEDIUMnet-imap rubygem vulnerable to possible DoS by memory exhaustionEPSS 0.5%CVE-2026-42257MEDIUMnet-imap: Command Injection via "raw" arguments to multiple commandsEPSS 0.4%CVE-2026-42245LOWnet-imap: Quadratic complexity when reading response literalsEPSS 0.4%