Upstream information

CVE-2026-42257 at MITRE

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.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having critical severity.

CVSS v3 Scores
CVSS detail National Vulnerability Database
Base Score 9.8
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
CVSSv3 Version 3.1
CVSS v4 Scores
CVSS detail CNA (GitHub)
Base Score 5.8
Vector CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Local
Attack Complexity Low
Attack Requirements Present
Privileges Required None
User Interaction Passive
Vulnerable System Confidentiality Impact None
Vulnerable System Integrity Impact High
Vulnerable System Availability Impact Low
Subsequent System Confidentiality Impact None
Subsequent System Integrity Impact None
Subsequent System Availability Impact None
CVSSv4 Version 4.0
SUSE Bugzilla entries: 1268337 [NEW], 1268338 [NEW]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
SUSE Liberty Linux 10
  • ruby >= 3.3.12-14.el10_2
  • ruby-bundled-gems >= 3.3.12-14.el10_2
  • ruby-default-gems >= 3.3.12-14.el10_2
  • ruby-devel >= 3.3.12-14.el10_2
  • ruby-doc >= 3.3.12-14.el10_2
  • ruby-libs >= 3.3.12-14.el10_2
  • rubygem-bigdecimal >= 3.1.5-14.el10_2
  • rubygem-bundler >= 2.5.22-14.el10_2
  • rubygem-io-console >= 0.7.1-14.el10_2
  • rubygem-irb >= 1.13.1-14.el10_2
  • rubygem-json >= 2.7.2-14.el10_2
  • rubygem-minitest >= 5.20.0-14.el10_2
  • rubygem-power_assert >= 2.0.3-14.el10_2
  • rubygem-psych >= 5.1.2-14.el10_2
  • rubygem-racc >= 1.7.3-14.el10_2
  • rubygem-rake >= 13.1.0-14.el10_2
  • rubygem-rbs >= 3.4.0-14.el10_2
  • rubygem-rdoc >= 6.6.3.1-14.el10_2
  • rubygem-rexml >= 3.4.4-14.el10_2
  • rubygem-rss >= 0.3.1-14.el10_2
  • rubygem-test-unit >= 3.6.1-14.el10_2
  • rubygem-typeprof >= 0.21.9-14.el10_2
  • rubygems >= 3.5.22-14.el10_2
  • rubygems-devel >= 3.5.22-14.el10_2
 Patchnames:
RHSA-2026:50778 (x86_64)
SUSE Liberty Linux 8
  • ruby >= 3.3.12-8.module+el8.10.0+24567+c4e5368e
  • ruby-bundled-gems >= 3.3.12-8.module+el8.10.0+24567+c4e5368e
  • ruby-default-gems >= 3.3.12-8.module+el8.10.0+24567+c4e5368e
  • ruby-devel >= 3.3.12-8.module+el8.10.0+24567+c4e5368e
  • ruby-doc >= 3.3.12-8.module+el8.10.0+24567+c4e5368e
  • ruby-libs >= 3.3.12-8.module+el8.10.0+24567+c4e5368e
  • rubygem-abrt >= 0.4.0-1.module+el8.10.0+21226+b78a28c4
  • rubygem-abrt-doc >= 0.4.0-1.module+el8.10.0+21226+b78a28c4
  • rubygem-bigdecimal >= 3.1.5-8.module+el8.10.0+24567+c4e5368e
  • rubygem-bundler >= 2.5.22-8.module+el8.10.0+24567+c4e5368e
  • rubygem-io-console >= 0.7.1-8.module+el8.10.0+24567+c4e5368e
  • rubygem-irb >= 1.13.1-8.module+el8.10.0+24567+c4e5368e
  • rubygem-json >= 2.7.2-8.module+el8.10.0+24567+c4e5368e
  • rubygem-minitest >= 5.20.0-8.module+el8.10.0+24567+c4e5368e
  • rubygem-mysql2 >= 0.5.5-1.module+el8.10.0+21226+b78a28c4
  • rubygem-mysql2-doc >= 0.5.5-1.module+el8.10.0+21226+b78a28c4
  • rubygem-pg >= 1.5.4-1.module+el8.10.0+21226+b78a28c4
  • rubygem-pg-doc >= 1.5.4-1.module+el8.10.0+21226+b78a28c4
  • rubygem-power_assert >= 2.0.3-8.module+el8.10.0+24567+c4e5368e
  • rubygem-psych >= 5.1.2-8.module+el8.10.0+24567+c4e5368e
  • rubygem-racc >= 1.7.3-8.module+el8.10.0+24567+c4e5368e
  • rubygem-rake >= 13.1.0-8.module+el8.10.0+24567+c4e5368e
  • rubygem-rbs >= 3.4.0-8.module+el8.10.0+24567+c4e5368e
  • rubygem-rdoc >= 6.6.3.1-8.module+el8.10.0+24567+c4e5368e
  • rubygem-rexml >= 3.4.4-8.module+el8.10.0+24567+c4e5368e
  • rubygem-rss >= 0.3.1-8.module+el8.10.0+24567+c4e5368e
  • rubygem-test-unit >= 3.6.1-8.module+el8.10.0+24567+c4e5368e
  • rubygem-typeprof >= 0.21.9-8.module+el8.10.0+24567+c4e5368e
  • rubygems >= 3.5.22-8.module+el8.10.0+24567+c4e5368e
  • rubygems-devel >= 3.5.22-8.module+el8.10.0+24567+c4e5368e
 Patchnames:
RHSA-2026:50728 (i686,x86_64)
SUSE Liberty Linux 9
  • ruby >= 4.0.6-34.module+el9.8.0+24564+e55418dc
  • ruby-bundled-gems >= 4.0.6-34.module+el9.8.0+24564+e55418dc
  • ruby-default-gems >= 4.0.6-34.module+el9.8.0+24564+e55418dc
  • ruby-devel >= 4.0.6-34.module+el9.8.0+24564+e55418dc
  • ruby-doc >= 4.0.6-34.module+el9.8.0+24564+e55418dc
  • ruby-libs >= 4.0.6-34.module+el9.8.0+24564+e55418dc
  • rubygem-bigdecimal >= 4.0.1-34.module+el9.8.0+24564+e55418dc
  • rubygem-bundler >= 4.0.16-34.module+el9.8.0+24564+e55418dc
  • rubygem-io-console >= 0.8.2-34.module+el9.8.0+24564+e55418dc
  • rubygem-irb >= 1.16.0-34.module+el9.8.0+24564+e55418dc
  • rubygem-json >= 2.18.0-34.module+el9.8.0+24564+e55418dc
  • rubygem-minitest >= 6.0.0-34.module+el9.8.0+24564+e55418dc
  • rubygem-mysql2 >= 0.5.7-1.module+el9.8.0+24428+77f1d00a
  • rubygem-mysql2-doc >= 0.5.7-1.module+el9.8.0+24428+77f1d00a
  • rubygem-pg >= 1.6.3-1.module+el9.8.0+24428+77f1d00a
  • rubygem-pg-doc >= 1.6.3-1.module+el9.8.0+24428+77f1d00a
  • rubygem-power_assert >= 3.0.1-34.module+el9.8.0+24564+e55418dc
  • rubygem-psych >= 5.3.1-34.module+el9.8.0+24564+e55418dc
  • rubygem-racc >= 1.8.1-34.module+el9.8.0+24564+e55418dc
  • rubygem-rake >= 13.3.1-34.module+el9.8.0+24564+e55418dc
  • rubygem-rbs >= 3.10.0-34.module+el9.8.0+24564+e55418dc
  • rubygem-rdoc >= 7.0.4-34.module+el9.8.0+24564+e55418dc
  • rubygem-rexml >= 3.4.4-34.module+el9.8.0+24564+e55418dc
  • rubygem-rss >= 0.3.2-34.module+el9.8.0+24564+e55418dc
  • rubygem-test-unit >= 3.7.5-34.module+el9.8.0+24564+e55418dc
  • rubygem-typeprof >= 0.31.1-34.module+el9.8.0+24564+e55418dc
  • rubygems >= 4.0.16-34.module+el9.8.0+24564+e55418dc
  • rubygems-devel >= 4.0.16-34.module+el9.8.0+24564+e55418dc
 Patchnames:
RHSA-2026:50827 (i686,x86_64)
RHSA-2026:50828 (i686,x86_64)

SUSE Timeline for this CVE

CVE page created: Sat May 9 22:58:45 2026
CVE page last modified: Mon Aug 24 18:02:10 2026