UBUNTU-CVE-2026-118694

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Source
https://ubuntu.com/security/CVE-2026-118694
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118694.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-118694
Upstream
Published
2026-10-29T00:00:00Z
Modified
2026-10-29T20:04:30Z
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

python-markdown2 through 2.5.5 contains a denial of service vulnerability that allows remote users to exhaust CPU by submitting Markdown with unclosed inline link destinations. Attackers can submit repeated '[a](' or '![a](' sequences, causing _find_balanced to rescan the remaining document for each link and consume quadratic CPU time.

References

Affected packages

Ubuntu:20.04:LTS / python-markdown2

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118694.json"

Ubuntu:22.04:LTS / python-markdown2

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118694.json"

Ubuntu:24.04:LTS / python-markdown2

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118694.json"

Ubuntu:26.10 / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2?arch=source&distro=stonking

Affected ranges

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

Affected versions

2.*
2.5.4-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-markdown2",
            "binary_version":  "2.5.4-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118694.json"

Ubuntu:26.04:LTS / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/ubuntu/python-markdown2?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.4.11-1
2.5.4-2
2.5.4-3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "python3-markdown2",
            "binary_version":  "2.5.4-3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-118694.json"