UBUNTU-CVE-2026-42257

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-42257
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-42257
Upstream
Published
2026-05-09T20:16:00Z
Modified
2026-05-20T16:13:00.355775924Z
Severity
  • 5.8 (Medium) CVSS_V4 - 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 CVSS Calculator
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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

Affected packages

Ubuntu:16.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.7.21-2ubuntu4
1.7.22-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jruby",
            "binary_version": "1.7.22-1ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:18.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.1.13.0-1
9.1.17.0-1~18.04

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jruby",
            "binary_version": "9.1.17.0-1~18.04"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:20.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.1.17.0-3
9.1.17.0-3build5
9.1.17.0-3build6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jruby",
            "binary_version": "9.1.17.0-3build6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:22.04:LTS
ruby3.0

Package

Name
ruby3.0
Purl
pkg:deb/ubuntu/ruby3.0?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.0.2-7ubuntu2.12",
            "binary_name": "libruby3.0"
        },
        {
            "binary_name": "ruby3.0",
            "binary_version": "3.0.2-7ubuntu2.12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:24.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.3.9.0+ds-1
9.4.5.0+ds-1
9.4.5.0+ds-1ubuntu1
9.4.6.0+ds-1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jruby",
            "binary_version": "9.4.6.0+ds-1ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
ruby3.2

Package

Name
ruby3.2
Purl
pkg:deb/ubuntu/ruby3.2?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libruby3.2",
            "binary_version": "3.2.3-1ubuntu0.24.04.7"
        },
        {
            "binary_name": "ruby3.2",
            "binary_version": "3.2.3-1ubuntu0.24.04.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:25.10
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.4.8.0+ds-2ubuntu1
9.4.8.0+ds-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "9.4.8.0+ds-3ubuntu1",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
ruby3.3

Package

Name
ruby3.3
Purl
pkg:deb/ubuntu/ruby3.3?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3.7-1ubuntu2
3.3.8-2ubuntu1
3.3.8-2ubuntu2
3.3.8-2ubuntu2.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libruby3.3",
            "binary_version": "3.3.8-2ubuntu2.1"
        },
        {
            "binary_name": "ruby3.3",
            "binary_version": "3.3.8-2ubuntu2.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:26.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.4.8.0+ds-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "jruby",
            "binary_version": "9.4.8.0+ds-3ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
ruby3.3

Package

Name
ruby3.3
Purl
pkg:deb/ubuntu/ruby3.3?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.3.8-2ubuntu2
3.3.8-2ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.3.8-2ubuntu3",
            "binary_name": "libruby3.3"
        },
        {
            "binary_name": "ruby3.3",
            "binary_version": "3.3.8-2ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:Pro:14.04:LTS
jruby

Package

Name
jruby
Purl
pkg:deb/ubuntu/jruby?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.5.6-5ubuntu1
1.5.6-6
1.5.6-7
1.5.6-9+deb8u2build0.14.04.1~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.5.6-9+deb8u2build0.14.04.1~esm2",
            "binary_name": "jruby"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:Pro:16.04:LTS
ruby2.3

Package

Name
ruby2.3
Purl
pkg:deb/ubuntu/ruby2.3?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.3.1-2~ubuntu16.04.16+esm12",
            "binary_name": "libruby2.3"
        },
        {
            "binary_name": "ruby2.3",
            "binary_version": "2.3.1-2~ubuntu16.04.16+esm12"
        },
        {
            "binary_name": "ruby2.3-tcltk",
            "binary_version": "2.3.1-2~ubuntu16.04.16+esm12"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:Pro:18.04:LTS
ruby2.5

Package

Name
ruby2.5
Purl
pkg:deb/ubuntu/ruby2.5?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libruby2.5",
            "binary_version": "2.5.1-1ubuntu1.16+esm7"
        },
        {
            "binary_name": "ruby2.5",
            "binary_version": "2.5.1-1ubuntu1.16+esm7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"
Ubuntu:Pro:20.04:LTS
ruby2.7

Package

Name
ruby2.7
Purl
pkg:deb/ubuntu/ruby2.7?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.7.0-5ubuntu1.18+esm4",
            "binary_name": "libruby2.7"
        },
        {
            "binary_name": "ruby2.7",
            "binary_version": "2.7.0-5ubuntu1.18+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-42257.json"