CVE-2026-42257
CRITICALnet-imap: Command Injection via "raw" arguments to multiple commands
Title source: cnaDescription
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.
References (4)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/ruby/net-imap/security/advisories/GHSA-hm49-wcqc-g2xg
X_Refsource_Misc x_refsource_misc
https://github.com/ruby/net-imap/releases/tag/v0.4.24
X_Refsource_Misc x_refsource_misc
https://github.com/ruby/net-imap/releases/tag/v0.5.14
X_Refsource_Misc x_refsource_misc
https://github.com/ruby/net-imap/releases/tag/v0.6.4
Scores
CVSS v3
9.8
EPSS
0.0002
EPSS Percentile
3.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-77
CWE-93
Status
published
Products (7)
ruby/net-imap
< 0.4.24
ruby/net-imap
>= 0.5.0, < 0.5.14
ruby/net-imap
>= 0.6.0, < 0.6.4
ruby-lang/net\
< 0.4.24
rubygems/net-imap
0 - 0.4.24RubyGems
rubygems/net-imap
0.5.0 - 0.5.14RubyGems
rubygems/net-imap
0.6.0 - 0.6.4RubyGems
Published
May 09, 2026
Tracked Since
May 10, 2026