cvedb.io
CVE-2026-42257
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2026-05-09T20:16:28.463 · Last modified 2026-06-17T10:47:35.563

Summary

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, 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. This issue has been patched in versions 0.4.24, 0.5.14, and 0.6.4.

Affected products

ruby-lang — net\

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.