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CVE-2025-43857

CVE-2025-43857 · net-imap rubygem vulnerable to possible DoS by memory exhaustion

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 0.5.7, 0.4.20, 0.3.9, and 0.2.5, there is a possibility for denial of service by memory exhaustion when net-imap reads server responses. At any time while the client is connected, a malicious server can send can send a "literal" byte count, which is automatically read by the client's receiver thread. The response reader immediately allocates memory for the number of bytes indicated by the server response. This should not be an issue when securely connecting to trusted IMAP servers that are well-behaved. It can affect insecure connections and buggy, untrusted, or compromised servers (for example, connecting to a user supplied hostname). This issue has been patched in versions 0.5.7, 0.4.20, 0.3.9, and 0.2.5.

CVSS 6.0 · Medium · EPSS 0.5%

Published
Updated

Stack: system

Affected products and versions

  • net-imap

    Versions
    • >= 0.5.0, < 0.5.7: Affected
    • >= 0.4.0, < 0.4.20: Affected
    • >= 0.3.0, < 0.3.9: Affected
    • >= 0, < 0.2.5: 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

  • 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
    • 2.5.1-1ubuntu1.16+esm8
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 2.7.0-5ubuntu1.18+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 3.0.2-7ubuntu2.13
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 3.2.3-1ubuntu0.24.04.8
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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

  • ruby3.3 Ubuntu:26.10

    Versions
    • 3.3.8-2ubuntu3
    • 3.3.8-2.2ubuntu4
    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
    • 3.3.8-2ubuntu3.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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