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DEBIAN-CVE-2026-33347

Type: advisorySource: OSV1 source record

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.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-33347

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-33347

php-league-commonmark

Source reference: /affected/0/package/name

Affected versions
2.3.9-1

Source reference: /affected/0/versions

Fixed versions
2.3.9-1+deb12u1

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

php-league-commonmark

Source reference: /affected/1/package/name

Affected versions
2.7.0-1

Source reference: /affected/1/versions

Fixed versions
2.7.0-1+deb13u1

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

php-league-commonmark

Source reference: /affected/2/package/name

Affected versions
2.7.0-1

Source reference: /affected/2/versions

2.7.1-1

Source reference: /affected/2/versions

2.7.1-2

Source reference: /affected/2/versions

2.8.0-1

Source reference: /affected/2/versions

2.8.1-1

Source reference: /affected/2/versions

Fixed versions
2.8.2-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.3.9-1+deb12u1"
          }
        ]
      }
    ],
    "package": {
      "name": "php-league-commonmark",
      "purl": "pkg:deb/debian/php-league-commonmark?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "2.3.9-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33347.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.7.0-1+deb13u1"
          }
        ]
      }
    ],
    "package": {
      "name": "php-league-commonmark",
      "purl": "pkg:deb/debian/php-league-commonmark?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "2.7.0-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33347.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.8.2-1"
          }
        ]
      }
    ],
    "package": {
      "name": "php-league-commonmark",
      "purl": "pkg:deb/debian/php-league-commonmark?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "2.7.0-1",
      "2.7.1-1",
      "2.7.1-2",
      "2.8.0-1",
      "2.8.1-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-33347.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#55948 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-33347 · Revision 1Source updated