UBUNTU-CVE-2021-26813

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Source
https://ubuntu.com/security/CVE-2021-26813
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-26813.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-26813
Upstream
Published
2021-03-03T16:15:00Z
Modified
2025-10-24T04:50:10Z
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

markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.

References

Affected packages

Ubuntu:20.04:LTS / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2@2.3.7-2?arch=source&distro=focal

Affected ranges

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

Affected versions

2.*

2.3.7-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-markdown2",
            "binary_version": "2.3.7-2"
        }
    ]
}

Ubuntu:22.04:LTS / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2@2.4.1-1?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*

2.3.10-1.1
2.4.1-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-markdown2",
            "binary_version": "2.4.1-1"
        }
    ]
}

Ubuntu:24.04:LTS / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2@2.4.11-1?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*

2.4.1-1
2.4.11-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-markdown2",
            "binary_version": "2.4.11-1"
        }
    ]
}

Ubuntu:25.10 / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2@2.4.11-1?arch=source&distro=questing

Affected ranges

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

Affected versions

2.*

2.4.11-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-markdown2",
            "binary_version": "2.4.11-1"
        }
    ]
}

Ubuntu:25.04 / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2@2.4.11-1?arch=source&distro=plucky

Affected ranges

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

Affected versions

2.*

2.4.11-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-markdown2",
            "binary_version": "2.4.11-1"
        }
    ]
}