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CVE-2026-42257

Published: May 9, 2026

Modified: May 13, 2026

PUBLISHED

Description

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.

Vendor	Product	Versions
ruby	net-imap	affected `< 0.4.24` affected `>= 0.5.0, < 0.5.14` affected `>= 0.6.0, < 0.6.4`

Weaknesses (CWE)

References

https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg

x_refsource_CONFIRM

https://github.com/ruby/net-imap/releases/tag/v0.4.24

x_refsource_MISC

https://github.com/ruby/net-imap/releases/tag/v0.5.14

x_refsource_MISC

https://github.com/ruby/net-imap/releases/tag/v0.6.4

x_refsource_MISC

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