net-imap vulnerable to command Injection via "raw" arguments to multiple commands — CVE-2026-42257

Summary

### Summary Several `Net::IMAP` commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled input, it may contain contain `CRLF` sequences, which an attacker can use to inject arbitrary IMAP commands. ### Details `Net::IMAP`'s generic argument handling, used by most command arguments, interprets string arguments as an IMAP…

Product

rubygems: net-imap

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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