DEBIAN-CVE-2026-30838

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Source
https://security-tracker.debian.org/tracker/CVE-2026-30838
Import Source
https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30838.json
JSON Data
https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-30838
Upstream
Published
2026-03-07T16:15:56.250Z
Modified
2026-03-12T09:00:54.327740Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

league/commonmark is a PHP Markdown parser. Prior to version 2.8.1, the DisallowedRawHtml extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing >. For example, <script\n> would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input. All applications using the DisallowedRawHtml extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected. This issue has been patched in version 2.8.1.

References

Affected packages

Debian:11 / php-league-commonmark

Package

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

Affected ranges

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

Affected versions

1.*
1.5.7-2
1.5.8-1
1.6.2-1
1.6.6-1
1.6.7-1
2.*
2.1.1-1
2.2.0-1
2.2.1-1
2.2.2-1
2.2.3-1
2.3.3-1
2.3.3-2
2.3.3-3
2.3.4-1
2.3.5-1
2.3.6-1
2.3.7-1
2.3.8-1
2.3.9-1
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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30838.json"

Debian:12 / php-league-commonmark

Package

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

Affected ranges

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

Affected versions

2.*
2.3.9-1
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

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30838.json"

Debian:13 / php-league-commonmark

Package

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

Affected ranges

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

Affected versions

2.*
2.7.0-1
2.7.1-1
2.7.1-2
2.8.0-1
2.8.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30838.json"

Debian:14 / php-league-commonmark

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.8.1-1

Affected versions

2.*
2.7.0-1
2.7.1-1
2.7.1-2
2.8.0-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-30838.json"