php-league-commonmark: league/commonmark is a PHP Markdown parser
CVE-2026-33347 is fixed in php-league-commonmark on 1 platform, first by php-league-commonmark 1.3.1-1ubuntu2+esm1, released March 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.
league/commonmark is a PHP Markdown parser. From version 2.3.0 to before version 2.8.2, the DomainFilteringAdapter in the Embed extension is vulnerable to an allowlist bypass due to a missing hostname boundary assertion in the domain-matching regex. An attacker-controlled domain like youtube.com.evil passes the allowlist check when youtube.com is an allowed domain. This issue has been patched in version 2.8.2.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| php-league-commonmark · Debian 12.15 (bookworm) | 2.3.9-1+deb12u1 | DEBIAN-CVE-2026-33347 | Mar 24, 2026 |
| php-league-commonmark · Debian 13.5 (trixie) | 2.7.0-1+deb13u1 | DEBIAN-CVE-2026-33347 | Mar 24, 2026 |
| php-league-commonmark · Debian 14 | 2.8.2-1 | DEBIAN-CVE-2026-33347 | Mar 24, 2026 |
| php-league-commonmark · Ubuntu 20.04 LTS (focal) | 1.3.1-1ubuntu2+esm1 | php-league-commonmark 1.3.1-1ubuntu2+esm1 | Mar 24, 2026 |
| php-league-commonmark · Ubuntu 22.04.1 LTS (jammy) | 1.6.7-1ubuntu0.1~esm1 | php-league-commonmark 1.6.7-1ubuntu0.1~esm1 | Mar 24, 2026 |
| php-league-commonmark · Ubuntu 24.04.5 LTS (noble) | 2.4.2-2ubuntu0.1~esm1 | php-league-commonmark 2.4.2-2ubuntu0.1~esm1 | Mar 24, 2026 |
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