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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.

PUBLISHED Reserved 2026-04-26 | Published 2026-05-09 | Updated 2026-05-09 | Assigner GitHub_M




MEDIUM: 5.8CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')

Product status

< 0.4.24
affected

>= 0.5.0, < 0.5.14
affected

>= 0.6.0, < 0.6.4
affected

References

github.com/...t-imap/security/advisories/GHSA-hm49-wcqc-g2xg

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

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

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

cve.org (CVE-2026-42257)

nvd.nist.gov (CVE-2026-42257)

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