{
    "cve": "CVE-2026-67434",
    "vuln_id": "VULN-000011",
    "record": {
        "id": "VULN-000011",
        "schema_version": "v1",
        "preferred_id": "GHSA-mh25-x5hq-wrqp",
        "aliases": [
            "GHSA-mh25-x5hq-wrqp",
            "GHSA-hmqg-cxww-wqhq",
            "CVE-2026-67434"
        ],
        "summary": "league/commonmark: Denial of service via colliding heading slugs",
        "references": [
            {
                "type": "advisory",
                "url": "https://github.com/thephpleague/commonmark/security/advisories/GHSA-mh25-x5hq-wrqp"
            },
            {
                "type": "advisory",
                "url": "https://github.com/thephpleague/commonmark/releases/tag/2.9.0"
            },
            {
                "type": "advisory",
                "url": "https://github.com/advisories/GHSA-mh25-x5hq-wrqp"
            },
            {
                "type": "advisory",
                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer/security/advisories/GHSA-hmqg-cxww-wqhq"
            },
            {
                "type": "advisory",
                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer/pull/1473"
            },
            {
                "type": "advisory",
                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer/commit/7a3a6bbf153a03fa3a9413afc60bded6b764e76b"
            },
            {
                "type": "advisory",
                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer/commit/f0e1ebb0563f0e5d7f190497a787bcaf8474f3fe"
            },
            {
                "type": "advisory",
                "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/squizlabs/php_codesniffer/CVE-2026-67434.yaml"
            },
            {
                "type": "advisory",
                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer/releases/tag/3.13.6"
            },
            {
                "type": "advisory",
                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer/releases/tag/4.0.2"
            },
            {
                "type": "advisory",
                "url": "https://github.com/advisories/GHSA-hmqg-cxww-wqhq"
            }
        ],
        "severity": [
            {
                "type": "CVSSv3",
                "score": "7.5|CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
            },
            {
                "type": "CVSSv3",
                "score": "0|"
            }
        ],
        "affected": [
            {
                "package": {
                    "ecosystem": "Packagist",
                    "name": "league/commonmark"
                },
                "ranges": [
                    {
                        "type": "ECOSYSTEM",
                        "events": [
                            {
                                "introduced": ">= 2.0.0, < 2.9.0"
                            },
                            {
                                "fixed": "2.9.0"
                            }
                        ]
                    }
                ]
            },
            {
                "package": {
                    "ecosystem": "Packagist",
                    "name": "squizlabs/php_codesniffer"
                },
                "ranges": [
                    {
                        "type": "ECOSYSTEM",
                        "events": [
                            {
                                "introduced": ">= 4.0.0, < 4.0.2"
                            },
                            {
                                "fixed": "4.0.2"
                            }
                        ]
                    }
                ]
            }
        ],
        "source": {
            "ghsa_ids": [
                "GHSA-mh25-x5hq-wrqp",
                "GHSA-hmqg-cxww-wqhq"
            ]
        },
        "flags": [],
        "published": "2026-08-06T20:41:45Z",
        "modified": "2026-08-06T20:41:46Z"
    }
}