UBUNTU-CVE-2026-71488

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Source
https://ubuntu.com/security/CVE-2026-71488
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-71488
Upstream
Published
2026-08-07T00:00:00Z
Modified
2026-08-07T17:45:33.245836807Z
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

league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 0.6.0 until 2.9.0, specially crafted Markdown lines can cause the parser to have quadratic time complexity when converting, because several parsing paths repeatedly rescan growing portions of a line to translate between character positions and byte positions, and the Autolink extension can also copy and validate the remaining line at every URL-like prefix, allowing an attacker who can submit Markdown for conversion to consume disproportionate CPU time with a comparatively small request. This issue is fixed in 2.9.0.

References

Affected packages

Ubuntu:16.04:LTS
markdown

Package

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

Affected ranges

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

Affected versions

1.*
1.0.1-7
1.0.1-8

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.1-8",
            "binary_name": "markdown"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
Ubuntu:18.04:LTS
markdown

Package

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

Affected ranges

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

Affected versions

1.*
1.0.1-9
1.0.1-10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.1-10",
            "binary_name": "markdown"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
Ubuntu:20.04:LTS
markdown

Package

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

Affected ranges

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

Affected versions

1.*
1.0.1-10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.1-10",
            "binary_name": "markdown"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
Ubuntu:22.04:LTS
commonmark

Package

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

Affected ranges

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

Affected versions

0.*
0.9.1-3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.1-3",
            "binary_name": "python3-commonmark"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
markdown

Package

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

Affected ranges

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

Affected versions

1.*
1.0.1-10.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.1-10.1",
            "binary_name": "markdown"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
Ubuntu:24.04:LTS
commonmark

Package

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

Affected ranges

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

Affected versions

0.*
0.9.1-4
0.9.1-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.1-5",
            "binary_name": "python3-commonmark"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
markdown

Package

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

Affected ranges

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

Affected versions

1.*
1.0.1-12

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.1-12",
            "binary_name": "markdown"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
Ubuntu:26.04:LTS
commonmark

Package

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

Affected ranges

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

Affected versions

0.*
0.9.1-8
0.9.1-8build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.9.1-8build1",
            "binary_name": "python3-commonmark"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"
markdown

Package

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

Affected ranges

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

Affected versions

1.*
1.0.1-14

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.0.1-14",
            "binary_name": "markdown"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-71488.json"