UBUNTU-CVE-2026-88753

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-88753
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88753.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-88753
Upstream
  • CVE-2026-88753
Published
2026-10-16T00:00:00Z
Modified
2026-10-17T13:01:15Z
Severity
  • Ubuntu - medium
Summary
[none]
Details

A Regular-Expression Denial of Service (ReDoS) in the Markdown2. extract_metadata() function (lib/markdown2.py) of trentm markdown2 through v2.5.5 allows attackers to cause a Denial of Service (DoS) via a crafted Markdown document.

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-2026-88753.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-2026-88753.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-2026-88753.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-2026-88753.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-2026-88753.json"