UBUNTU-CVE-2026-86435

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Source
https://ubuntu.com/security/CVE-2026-86435
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86435.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-86435
Upstream
  • CVE-2026-86435
Published
2026-09-07T13:20:00Z
Modified
2026-09-16T14:03:21Z
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
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Footnote extension that fails to deduplicate footnote definitions. Attackers can craft documents with duplicate footnote definitions and references to create quadratic output expansion, consuming excessive memory and CPU to exhaust server resources.

References

Affected packages

Ubuntu:Pro:20.04:LTS / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

1.*
1.1.2-1
1.2.0-1
1.3.0-1
1.3.1-1
1.3.1-1ubuntu2
1.3.1-1ubuntu2+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "php-league-commonmark",
            "binary_version":  "1.3.1-1ubuntu2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86435.json"

Ubuntu:Pro:22.04:LTS / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

1.*
1.5.7-2build1
1.6.6-1build1
1.6.7-1
1.6.7-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "php-league-commonmark",
            "binary_version":  "1.6.7-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86435.json"

Ubuntu:Pro:24.04:LTS / php-league-commonmark

Package

Name
php-league-commonmark
Purl
pkg:deb/ubuntu/php-league-commonmark?arch=source&distro=esm-apps%2Fnoble

Affected ranges

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

Affected versions

2.*
2.3.9-1
2.4.1-1
2.4.2-1
2.4.2-2
2.4.2-2ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "php-league-commonmark",
            "binary_version":  "2.4.2-2ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86435.json"

Ubuntu:26.04:LTS / php-league-commonmark

Package

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

Affected ranges

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

Affected versions

2.*
2.7.0-1
2.7.1-2
2.8.0-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "php-league-commonmark",
            "binary_version":  "2.8.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86435.json"