Amazon Linux 2023: CVE-2025-43857: Medium priority package update for ruby3.2

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a "literal" byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.
A flaw was found in Net::IMAP, a Ruby library for IMAP client functionality. This vulnerability allows a malicious server to send a large "literal" byte count, causing the client to allocate excessive memory, potentially leading to denial of service (memory exhaustion). This vulnerability could allow an attacker to overload the system's memory, causing performance degradation or crashes when connecting to untrusted or compromised IMAP servers.