UBUNTU-CVE-2019-6293

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Source
https://ubuntu.com/security/CVE-2019-6293
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-6293.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2019-6293
Upstream
Published
2019-01-15T00:29:00Z
Modified
2025-10-24T04:47:29Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - low
Summary
[none]
Details

An issue was discovered in the function markbeginningasnormal in nfa.c in flex 2.6.4. There is a stack exhaustion problem caused by the markbeginningasnormal function making recursive calls to itself in certain scenarios involving lots of '*' characters. Remote attackers could leverage this vulnerability to cause a denial-of-service.

References

Affected packages

Ubuntu:16.04:LTS

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.0-11?arch=source&distro=xenial

Affected ranges

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

Affected versions

2.*

2.5.39-8
2.6.0-1
2.6.0-3
2.6.0-4
2.6.0-6
2.6.0-7
2.6.0-8
2.6.0-9
2.6.0-11

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.0-11"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.0-11"
        }
    ]
}

Ubuntu:18.04:LTS

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.4-6?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*

2.6.1-1.3
2.6.4-1
2.6.4-2
2.6.4-3
2.6.4-4
2.6.4-5
2.6.4-6

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.4-6"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.4-6"
        },
        {
            "binary_name": "libfl2",
            "binary_version": "2.6.4-6"
        }
    ]
}

Ubuntu:20.04:LTS

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.4-6.2?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*

2.6.4-6.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.4-6.2"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.4-6.2"
        },
        {
            "binary_name": "libfl2",
            "binary_version": "2.6.4-6.2"
        }
    ]
}

Ubuntu:22.04:LTS

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.4-8build2?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*

2.6.4-8build1
2.6.4-8build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.4-8build2"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.4-8build2"
        },
        {
            "binary_name": "libfl2",
            "binary_version": "2.6.4-8build2"
        }
    ]
}

Ubuntu:24.04:LTS

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.4-8.2build1?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*

2.6.4-8.2
2.6.4-8.2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.4-8.2build1"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.4-8.2build1"
        },
        {
            "binary_name": "libfl2",
            "binary_version": "2.6.4-8.2build1"
        }
    ]
}

Ubuntu:25.04

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.4-8.2build1?arch=source&distro=plucky

Affected ranges

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

Affected versions

2.*

2.6.4-8.2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.4-8.2build1"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.4-8.2build1"
        },
        {
            "binary_name": "libfl2",
            "binary_version": "2.6.4-8.2build1"
        }
    ]
}

Ubuntu:25.10

flex

Package

Name
flex
Purl
pkg:deb/ubuntu/flex@2.6.4-8.2build1?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*

2.6.4-8.2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "flex",
            "binary_version": "2.6.4-8.2build1"
        },
        {
            "binary_name": "libfl-dev",
            "binary_version": "2.6.4-8.2build1"
        },
        {
            "binary_name": "libfl2",
            "binary_version": "2.6.4-8.2build1"
        }
    ]
}