Medium [CVE-2026-47241] Net::IMAP: Denial of Service via malformed command input

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.

This vulnerability allows a remote attacker to cause a denial of service by sending specially crafted input to certain Net::IMAP commands. A Moderate denial of service flaw was found in the Net::IMAP Ruby client library.

This can prevent further processing of IMAP commands until the connection is manually closed, impacting the availability of services relying on the Net::IMAP client. Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-88. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Hardened Images.

Red Hat lists Red Hat 3scale API Management Platform 2 as not affected.