DEBIAN-CVE-2026-86430

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Source
https://security-tracker.debian.org/tracker/CVE-2026-86430
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86430.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-86430
Upstream
Published
2026-09-07T13:20:42Z
Modified
2026-09-11T08:47:33Z
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

league/commonmark versions before 2.9.1 contain multiple denial of service vulnerabilities in fenced code block detection, reference link label lookup, and emphasis delimiter processing that perform super-linear work on crafted input. Attackers can submit specially crafted Markdown with long backtick runs, nested brackets, or delimiter sequences to consume disproportionate CPU time and prevent legitimate requests from completing.

References

Affected packages

Debian:12 / php-league-commonmark

Package

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

Affected ranges

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

Affected versions

2.*
2.3.9-1
2.3.9-1+deb12u1
2.4.0-1
2.4.1-1
2.4.2-1
2.4.2-2
2.5.0-1
2.5.1-1
2.5.3-1
2.6.0-1
2.6.1-1
2.6.1-2
2.6.2-1
2.7.0-1
2.7.1-1
2.7.1-2
2.8.0-1
2.8.1-1
2.8.2-1
2.8.2-2
2.8.3-1
2.9.0-1
2.10.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86430.json"

Debian:13 / php-league-commonmark

Package

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

Affected ranges

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

Affected versions

2.*
2.7.0-1
2.7.0-1+deb13u1
2.7.1-1
2.7.1-2
2.8.0-1
2.8.1-1
2.8.2-1
2.8.2-2
2.8.3-1
2.9.0-1
2.10.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86430.json"

Debian:14 / php-league-commonmark

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.10.0-1

Affected versions

2.*
2.7.0-1
2.7.1-1
2.7.1-2
2.8.0-1
2.8.1-1
2.8.2-1
2.8.2-2
2.8.3-1
2.9.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86430.json"