UBUNTU-CVE-2026-56740

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Source
https://ubuntu.com/security/CVE-2026-56740
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-56740
Upstream
Published
2026-07-17T22:17:00Z
Modified
2026-07-29T10:18:39Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

JLine is a Java library for handling console input. Prior to 3.30.14, 4.0.16, and 4.2.1, the JLine3 Telnet server remote-telnet module does not limit the number of environment variables a client may inject via the Telnet NEW-ENVIRON option, and TelnetIO.readNEVariables() in TelnetIO.java:1127-1180 stores each variable pair in a HashMap held by ConnectionData, allowing an unauthenticated attacker to flood unique variable pairs before the terminating IAC SE byte and exhaust JVM heap memory with an OutOfMemoryError. This issue is fixed in versions 3.30.14, 4.0.16, and 4.2.1.

References

Affected packages

Ubuntu:14.04:LTS
jline

Package

Name
jline
Purl
pkg:deb/ubuntu/jline?arch=source&distro=trusty

Affected ranges

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

Affected versions

1.*
1.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=trusty

Affected ranges

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

Affected versions

2.*
2.11-1
2.11-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.11-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
Ubuntu:16.04:LTS
jline

Package

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

Affected ranges

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

Affected versions

1.*
1.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*
2.11-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.11-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
Ubuntu:18.04:LTS
jline

Package

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

Affected ranges

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

Affected versions

1.*
1.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.11-4
2.12.1-1
2.14.6-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.14.6-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
Ubuntu:20.04:LTS
jline

Package

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

Affected ranges

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

Affected versions

1.*
1.0-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*
2.14.6-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.14.6-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
Ubuntu:22.04:LTS
jline

Package

Name
jline
Purl
pkg:deb/ubuntu/jline?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.14.6-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.14.6-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline3

Package

Name
jline3
Purl
pkg:deb/ubuntu/jline3?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.3.1-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline3-java",
            "binary_version": "3.3.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
Ubuntu:24.04:LTS
jline

Package

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

Affected ranges

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

Affected versions

1.*
1.0-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.14.6-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.14.6-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline3

Package

Name
jline3
Purl
pkg:deb/ubuntu/jline3?arch=source&distro=noble

Affected ranges

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

Affected versions

3.*
3.3.1-3
3.3.1-3ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline3-java",
            "binary_version": "3.3.1-3ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
Ubuntu:26.04:LTS
jline

Package

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

Affected ranges

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

Affected versions

1.*
1.0-3
1.0-3build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline-java",
            "binary_version": "1.0-3build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline2

Package

Name
jline2
Purl
pkg:deb/ubuntu/jline2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.14.6-6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline2-java",
            "binary_version": "2.14.6-6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"
jline3

Package

Name
jline3
Purl
pkg:deb/ubuntu/jline3?arch=source&distro=resolute

Affected ranges

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

Affected versions

3.*
3.3.1-4
3.3.1-4build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libjline3-java",
            "binary_version": "3.3.1-4build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-56740.json"