php-league-commonmark: league/commonmark is a PHP library for parsing and rendering CommonMark Markdown
CVE-2026-71478 is fixed in php-league-commonmark on 1 platform by DEBIAN-CVE-2026-71478 (version 2.9.0-1), released August 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.
league/commonmark is a PHP library for parsing and rendering CommonMark Markdown. From 1.5.0 until 2.9.0, the AttributesExtension's href and src unsafe-link filter can be bypassed by embedding control bytes, such as a tab, carriage return, line feed, or leading C0 control character, in a javascript: URL that browsers discard before parsing the scheme, causing the browser to still execute the script even when the unsafe-link filter is enabled. This issue is fixed in 2.9.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| php-league-commonmark · Debian 14 | 2.9.0-1 | DEBIAN-CVE-2026-71478 | Aug 11, 2026 |
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