DEBIAN-CVE-2026-118694

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Source
https://security-tracker.debian.org/tracker/CVE-2026-118694
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118694.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-118694
Upstream
Published
2026-10-28T22:17:13Z
Modified
2026-10-30T10:00:24Z
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-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

Debian:12 / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/debian/python-markdown2?arch=source&distro=bookworm

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
2.5.3-1~exp1
2.5.4-1
2.5.4-2
2.5.4-3
2.5.4-4

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118694.json"

Debian:13 / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/debian/python-markdown2?arch=source&distro=trixie

Affected ranges

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

Affected versions

2.*
2.4.11-1
2.5.3-1~exp1
2.5.4-1
2.5.4-2
2.5.4-3
2.5.4-4

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118694.json"

Debian:14 / python-markdown2

Package

Name
python-markdown2
Purl
pkg:deb/debian/python-markdown2?arch=source&distro=forky

Affected ranges

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

Affected versions

2.*
2.4.11-1
2.5.3-1~exp1
2.5.4-1
2.5.4-2
2.5.4-3
2.5.4-4

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-118694.json"