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

CVE-2026-47242

CVE-2026-47242

Description

Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAP#id is called with a hash argument, although the ID field value strings are correctly quoted (escaping quoted specials), they were not validated to prohibit CRLF sequences. While Net::IMAP#enable does process its arguments for aliases, it does not validate them as valid atoms (or as a list of valid atoms). The #to_s value is sent verbatim. Arguments to either command could be used by an attacker to inject arbitrary IMAP commands. 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

78

Patches

Vulnerability mechanics

References

6

News mentions

0

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