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CVE-2026-42257

CVE-2026-42257 · net-imap: Command Injection via "raw" arguments to multiple commands

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 5.8 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • net-imap

    Versions
    • < 0.4.24: Affected
    • >= 0.5.0, < 0.5.14: Affected
    • >= 0.6.0, < 0.6.4: Affected

    No fix published

  • ruby3.1 Debian:12

    Versions
    • 3.1.2-7
    • 3.1.2-7+deb12u1
    • 3.1.2-7+hurd.1
    • 3.1.2-8
    • 3.1.2-8.1~exp1
    • 3.1.2-8.3
    • 3.1.2-8.4
    • 3.1.2-8.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby3.3 Debian:13

    Versions
    • 3.3.8-2
    • 3.3.8-2.1
    • 3.3.8-2.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby3.3 Debian:14

    Versions
    • 3.3.8-2
    • 3.3.8-2.1
    • 3.3.8-2.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • jruby Ubuntu:Pro:14.04:LTS

    Versions
    • 1.5.6-5ubuntu1
    • 1.5.6-6
    • 1.5.6-7
    • 1.5.6-9+deb8u2build0.14.04.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby2.3 Ubuntu:Pro:16.04:LTS

    Versions
    • 2.3.0-1
    • 2.3.0-2
    • 2.3.0-4ubuntu2
    • 2.3.0-4ubuntu3
    • 2.3.0-5ubuntu1
    • 2.3.1-2~16.04
    • 2.3.1-2~16.04.2
    • 2.3.1-2~16.04.4
    • 2.3.1-2~16.04.5
    • 2.3.1-2~16.04.6
    • 2.3.1-2~16.04.7
    • 2.3.1-2~16.04.9
    • 2.3.1-2~16.04.10
    • 2.3.1-2~16.04.11
    • 2.3.1-2~16.04.12
    • 2.3.1-2~ubuntu16.04.13
    • 2.3.1-2~ubuntu16.04.14
    • 2.3.1-2~ubuntu16.04.15
    • 2.3.1-2~ubuntu16.04.16
    • 2.3.1-2~ubuntu16.04.16+esm1
    • 2.3.1-2~ubuntu16.04.16+esm2
    • 2.3.1-2~ubuntu16.04.16+esm3
    • 2.3.1-2~ubuntu16.04.16+esm4
    • 2.3.1-2~ubuntu16.04.16+esm5
    • 2.3.1-2~ubuntu16.04.16+esm6
    • 2.3.1-2~ubuntu16.04.16+esm7
    • 2.3.1-2~ubuntu16.04.16+esm8
    • 2.3.1-2~ubuntu16.04.16+esm9
    • 2.3.1-2~ubuntu16.04.16+esm10
    • 2.3.1-2~ubuntu16.04.16+esm11
    • 2.3.1-2~ubuntu16.04.16+esm12
    Affected ranges
    • ECOSYSTEM: < 2.3.1-2~ubuntu16.04.16+esm14

    Update to 2.3.1-2~ubuntu16.04.16+esm14

  • jruby Ubuntu:16.04:LTS

    Versions
    • 1.7.21-2ubuntu4
    • 1.7.22-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby2.5 Ubuntu:Pro:18.04:LTS

    Versions
    • 2.5.0~preview1-1ubuntu2
    • 2.5.0-4ubuntu1
    • 2.5.0-4ubuntu4
    • 2.5.0-5ubuntu1
    • 2.5.0-6ubuntu1
    • 2.5.1-1ubuntu1
    • 2.5.1-1ubuntu1.1
    • 2.5.1-1ubuntu1.2
    • 2.5.1-1ubuntu1.4
    • 2.5.1-1ubuntu1.5
    • 2.5.1-1ubuntu1.6
    • 2.5.1-1ubuntu1.7
    • 2.5.1-1ubuntu1.8
    • 2.5.1-1ubuntu1.9
    • 2.5.1-1ubuntu1.10
    • 2.5.1-1ubuntu1.11
    • 2.5.1-1ubuntu1.12
    • 2.5.1-1ubuntu1.13
    • 2.5.1-1ubuntu1.14
    • 2.5.1-1ubuntu1.15
    • 2.5.1-1ubuntu1.16
    • 2.5.1-1ubuntu1.16+esm1
    • 2.5.1-1ubuntu1.16+esm3
    • 2.5.1-1ubuntu1.16+esm4
    • 2.5.1-1ubuntu1.16+esm5
    • 2.5.1-1ubuntu1.16+esm6
    • 2.5.1-1ubuntu1.16+esm7
    Affected ranges
    • ECOSYSTEM: < 2.5.1-1ubuntu1.16+esm8

    Update to 2.5.1-1ubuntu1.16+esm8

  • jruby Ubuntu:18.04:LTS

    Versions
    • 9.1.13.0-1
    • 9.1.17.0-1~18.04
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby2.7 Ubuntu:Pro:20.04:LTS

    Versions
    • 2.7.0-1
    • 2.7.0-2
    • 2.7.0-3
    • 2.7.0-4
    • 2.7.0-4ubuntu1
    • 2.7.0-5ubuntu1
    • 2.7.0-5ubuntu1.1
    • 2.7.0-5ubuntu1.2
    • 2.7.0-5ubuntu1.3
    • 2.7.0-5ubuntu1.4
    • 2.7.0-5ubuntu1.5
    • 2.7.0-5ubuntu1.6
    • 2.7.0-5ubuntu1.7
    • 2.7.0-5ubuntu1.8
    • 2.7.0-5ubuntu1.9
    • 2.7.0-5ubuntu1.10
    • 2.7.0-5ubuntu1.11
    • 2.7.0-5ubuntu1.12
    • 2.7.0-5ubuntu1.13
    • 2.7.0-5ubuntu1.14
    • 2.7.0-5ubuntu1.15
    • 2.7.0-5ubuntu1.16
    • 2.7.0-5ubuntu1.17
    • 2.7.0-5ubuntu1.18
    • 2.7.0-5ubuntu1.18+esm1
    • 2.7.0-5ubuntu1.18+esm3
    • 2.7.0-5ubuntu1.18+esm4
    Affected ranges
    • ECOSYSTEM: < 2.7.0-5ubuntu1.18+esm5

    Update to 2.7.0-5ubuntu1.18+esm5

  • jruby Ubuntu:20.04:LTS

    Versions
    • 9.1.17.0-3
    • 9.1.17.0-3build5
    • 9.1.17.0-3build6
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby3.0 Ubuntu:22.04:LTS

    Versions
    • 3.0.2-5ubuntu1
    • 3.0.2-7
    • 3.0.2-7ubuntu2
    • 3.0.2-7ubuntu2.1
    • 3.0.2-7ubuntu2.2
    • 3.0.2-7ubuntu2.3
    • 3.0.2-7ubuntu2.4
    • 3.0.2-7ubuntu2.5
    • 3.0.2-7ubuntu2.6
    • 3.0.2-7ubuntu2.7
    • 3.0.2-7ubuntu2.8
    • 3.0.2-7ubuntu2.10
    • 3.0.2-7ubuntu2.11
    • 3.0.2-7ubuntu2.12
    Affected ranges
    • ECOSYSTEM: < 3.0.2-7ubuntu2.13

    Update to 3.0.2-7ubuntu2.13

  • jruby Ubuntu:24.04:LTS

    Versions
    • 9.3.9.0+ds-1
    • 9.4.5.0+ds-1
    • 9.4.5.0+ds-1ubuntu1
    • 9.4.6.0+ds-1ubuntu3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby3.2 Ubuntu:24.04:LTS

    Versions
    • 3.2.3-1
    • 3.2.3-1build2
    • 3.2.3-1build3
    • 3.2.3-1ubuntu0.24.04.1
    • 3.2.3-1ubuntu0.24.04.3
    • 3.2.3-1ubuntu0.24.04.5
    • 3.2.3-1ubuntu0.24.04.6
    • 3.2.3-1ubuntu0.24.04.7
    Affected ranges
    • ECOSYSTEM: < 3.2.3-1ubuntu0.24.04.8

    Update to 3.2.3-1ubuntu0.24.04.8

  • jruby Ubuntu:25.10

    Versions
    • 9.4.8.0+ds-2ubuntu1
    • 9.4.8.0+ds-3ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby3.3 Ubuntu:25.10

    Versions
    • 3.3.7-1ubuntu2
    • 3.3.8-2ubuntu1
    • 3.3.8-2ubuntu2
    • 3.3.8-2ubuntu2.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • jruby Ubuntu:26.10

    Versions
    • 9.4.8.0+ds-3ubuntu1
    • 9.4.14.0+ds-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • jruby Ubuntu:26.04:LTS

    Versions
    • 9.4.8.0+ds-3ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • ruby3.3 Ubuntu:26.04:LTS

    Versions
    • 3.3.8-2ubuntu2
    • 3.3.8-2ubuntu3
    Affected ranges
    • ECOSYSTEM: < 3.3.8-2ubuntu3.1

    Update to 3.3.8-2ubuntu3.1

Original sources

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