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Medium severityNVD Advisory· Published Jun 22, 2026· Updated Jun 23, 2026

CVE-2026-47240

CVE-2026-47240

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, several Net::IMAP commands accept a "raw data" argument that is sent verbatim after validation to prevent command injection. However, if a server does not support non-synchronizing literals, it may still be possible to inject arbitrary IMAP commands inside non-synchronizing literals. A server without support for non-synchronizing literals may interpret the "+}\r\n" as the end of a malformed command line and respond with a tagged BAD. In that case, the contents of the literal will be interpreted as one or more new pipelined commands, allowing a CRLF command injection attack to succeed. This affects criteria for #search and #uid_search; search_keys for #sort, #thread, #uid_sort, and #uid_thread; and attr for #fetch and #uid_fetch. This vulnerability is fixed in 0.6.5 and 0.5.15.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
net-imapRubyGems
>= 0.6.0, < 0.6.4.10.6.4.1
net-imapRubyGems
< 0.5.150.5.15

Affected products

77

Patches

Vulnerability mechanics

References

6

News mentions

0

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