Command injection in net-imap - CVE-2026-47242

Vulnerability identifier: #VU162942

CSH Severity: Medium

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-47242

CWE-ID: CWE-77

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a highly privileged local attacker to inject arbitrary IMAP commands and delete mailboxes through an affected application.

The vulnerability exists due to missing argument validation in net-imap's Net::IMAP#id and Net::IMAP#enable methods when untrusted input contains command-separating CRLF sequences. A highly privileged local attacker can supply CRLF sequences followed by IMAP commands when a victim runs an application that passes attacker-controlled input to these methods.

net-imap
Debian Linux
Anolis OS
openEuler
rubygem-rss
rubygem-abrt-doc
rubygem-abrt
rubygem-mysql2
rubygem-mysql2-doc
rubygem-io-console
rubygem-typeprof
rubygem-pg
rubygem-pg-doc
rubygem-did_you_mean
rubygem-racc
rubygem-irb
rubygem-power_assert
rubygem-bundler
rubygem-json
rubygem-rbs
rubygem-openssl
rubygem-bigdecimal
ruby
ruby-irb
ruby-help
ruby-devel
ruby-debugsource
ruby-debuginfo
ruby-bundled-gems
rubygem-rexml
ruby-doc
ruby-libs
ruby-default-gems
rubygems-devel
rubygems
rubygem-test-unit
rubygem-psych
rubygem-minitest
rubygem-rdoc
rubygem-rake
ruby3.3 (Debian package)

Install security update from vendor's website.

net-imap - addressed in versions 0.4.25, 0.5.15, 0.6.4.1
rubygem-rss - addressed in versions 0.2.9-158, 0.2.9-159
rubygem-rss - update to 0.3.1-8
rubygem-abrt-doc - update to 0.4.0-1
rubygem-abrt - update to 0.4.0-1
rubygem-mysql2 - update to 0.5.5-1
rubygem-mysql2-doc - update to 0.5.5-1
rubygem-io-console - addressed in versions 0.6.0-158, 0.6.0-159
rubygem-io-console - update to 0.7.1-8
rubygem-typeprof - addressed in versions 0.21.3-158, 0.21.3-159
rubygem-typeprof - update to 0.21.9-8
rubygem-pg - update to 1.5.4-1
rubygem-pg-doc - update to 1.5.4-1
rubygem-did_you_mean - addressed in versions 1.6.3-158, 1.6.3-159
rubygem-racc - update to 1.7.3-8
rubygem-irb - update to 1.13.1-8
rubygem-power_assert - update to 2.0.3-8
rubygem-bundler - update to 2.5.22-8
rubygem-json - addressed in versions 2.6.3-158, 2.6.3-159
rubygem-json - update to 2.7.2-8
rubygem-rbs - addressed in versions 2.8.2-158, 2.8.2-159
rubygem-openssl - addressed in versions 3.1.0-158, 3.1.0-159
rubygem-bigdecimal - addressed in versions 3.1.3-158, 3.1.3-159
rubygem-bigdecimal - update to 3.1.5-8
ruby - addressed in versions 3.2.2-158, 3.2.2-159
ruby-irb - addressed in versions 3.2.2-158, 3.2.2-159
ruby-help - addressed in versions 3.2.2-158, 3.2.2-159
ruby-devel - addressed in versions 3.2.2-158, 3.2.2-159
ruby-debugsource - addressed in versions 3.2.2-158, 3.2.2-159
ruby-debuginfo - addressed in versions 3.2.2-158, 3.2.2-159
ruby-bundled-gems - addressed in versions 3.2.2-158, 3.2.2-159
rubygem-rexml - addressed in versions 3.2.5-158, 3.2.5-159
ruby-doc - update to 3.3.12-8
ruby-libs - update to 3.3.12-8
ruby-devel - update to 3.3.12-8
ruby-default-gems - update to 3.3.12-8
ruby-bundled-gems - update to 3.3.12-8
ruby - update to 3.3.12-8
rubygem-rbs - update to 3.4.0-8
rubygem-rexml - update to 3.4.4-8
rubygems-devel - addressed in versions 3.4.10-158, 3.4.10-159
rubygems - addressed in versions 3.4.10-158, 3.4.10-159
rubygem-test-unit - addressed in versions 3.5.7-158, 3.5.7-159
rubygems - update to 3.5.22-8
rubygems-devel - update to 3.5.22-8
rubygem-test-unit - update to 3.6.1-8
rubygem-psych - addressed in versions 5.0.1-158, 5.0.1-159
rubygem-psych - update to 5.1.2-8
rubygem-minitest - addressed in versions 5.16.3-158, 5.16.3-159
rubygem-minitest - update to 5.20.0-8
rubygem-rdoc - addressed in versions 6.5.0-158, 6.5.0-159
rubygem-rdoc - update to 6.6.3.1-8
rubygem-rake - addressed in versions 13.0.6-158, 13.0.6-159
rubygem-rake - update to 13.1.0-8
ruby3.3 (Debian package) - update to 3.3.13-0+deb13u1

• https://github.com/ruby/net-imap/security/advisories/GHSA-46q3-7gv7-qmgg

• Debian update for ruby3.3
• openEuler 24.03 LTS SP4 update for ruby
• openEuler 24.03 LTS SP1 update for ruby
• openEuler 24.03 LTS SP3 update for ruby
• Anolis OS update for ruby:3.3 module
• Multiple vulnerabilities in net-imap