UBUNTU-CVE-2026-77421

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Source
https://ubuntu.com/security/CVE-2026-77421
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77421.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-77421
Upstream
Published
2026-09-24T00:00:00Z
Modified
2026-09-25T06:38:23Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/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. From 3.0.0 until 3.30.15 and 4.3.1, the JLine built-in nano editor's regex search mode passes a user-controlled search term from doSearch(String text) in builtins/src/main/java/org/jline/builtins/Nano.java to Java's backtracking regular expression engine without a timeout or backtracking bound. A nested-quantifier expression evaluated against non-matching buffer content can consume excessive CPU and indefinitely block the editor session thread, and remote multi-user deployments can lose a worker thread for each affected session. This issue is fixed in versions 3.30.15 and 4.3.1.

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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.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-2026-77421.json"