DEBIAN-CVE-2019-25781

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Source
https://security-tracker.debian.org/tracker/CVE-2019-25781
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2019-25781.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2019-25781
Upstream
Published
2026-10-29T14:17:39Z
Modified
2026-11-04T10:00:04Z
Severity
  • 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.

References

Affected packages

Debian:12 / python-markdown

Package

Name
python-markdown
Purl
pkg:deb/debian/python-markdown?arch=source&distro=bookworm

Affected ranges

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

Affected versions

3.*
3.4.1-2
3.4.1-2+deb12u1
3.4.3-1
3.4.4-1
3.5.2-1
3.6-1
3.7-1
3.7-2
3.8.2-1
3.8.2-2
3.9-1
3.10-1
3.10-2
3.10.1-1
3.10.2-1
3.10.2-2
3.10.3-1
3.11.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2019-25781.json"

Debian:13 / python-markdown

Package

Name
python-markdown
Purl
pkg:deb/debian/python-markdown?arch=source&distro=trixie

Affected ranges

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

Affected versions

3.*
3.7-2
3.7-2+deb13u1
3.8.2-1
3.8.2-2
3.9-1
3.10-1
3.10-2
3.10.1-1
3.10.2-1
3.10.2-2
3.10.3-1
3.11.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2019-25781.json"

Debian:14 / python-markdown

Package

Name
python-markdown
Purl
pkg:deb/debian/python-markdown?arch=source&distro=forky

Affected ranges

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

Affected versions

3.*
3.7-2
3.8.2-1
3.8.2-2
3.9-1
3.10-1
3.10-2
3.10.1-1
3.10.2-1
3.10.2-2
3.10.3-1
3.11.2-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2019-25781.json"