{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-45304",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-05-11T20:14:43.202Z",
        "datePublished": "2026-07-14T18:48:49.329Z",
        "dateUpdated": "2026-07-14T19:13:39.323Z"
    },
    "containers": {
        "cna": {
            "title": "Symfony: YAML Parser Exponential Memory Allocation via Recursive Collection-Alias Expansion (\"Billion Laughs\")",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-776",
                            "lang": "en",
                            "description": "CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.7,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4"
                },
                {
                    "name": "https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a"
                },
                {
                    "name": "https://github.com/symfony/symfony/releases/tag/v5.4.52",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/symfony/symfony/releases/tag/v5.4.52"
                },
                {
                    "name": "https://github.com/symfony/symfony/releases/tag/v6.4.40",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/symfony/symfony/releases/tag/v6.4.40"
                },
                {
                    "name": "https://github.com/symfony/symfony/releases/tag/v7.4.12",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/symfony/symfony/releases/tag/v7.4.12"
                },
                {
                    "name": "https://github.com/symfony/symfony/releases/tag/v8.0.12",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/symfony/symfony/releases/tag/v8.0.12"
                }
            ],
            "affected": [
                {
                    "vendor": "symfony",
                    "product": "symfony",
                    "versions": [
                        {
                            "version": "< 5.4.52",
                            "status": "affected"
                        },
                        {
                            "version": ">= 6.0.0-BETA1, < 6.4.40",
                            "status": "affected"
                        },
                        {
                            "version": ">= 7.0.0-BETA1, < 7.4.12",
                            "status": "affected"
                        },
                        {
                            "version": ">= 8.0.0-BETA1, < 8.0.12",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "symfony",
                    "product": "yaml",
                    "versions": [
                        {
                            "version": "< 5.4.52",
                            "status": "affected"
                        },
                        {
                            "version": ">= 6.0.0-BETA1, < 6.4.40",
                            "status": "affected"
                        },
                        {
                            "version": ">= 7.0.0-BETA1, < 7.4.12",
                            "status": "affected"
                        },
                        {
                            "version": ">= 8.0.0-BETA1, < 8.0.12",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-07-14T18:48:49.329Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\\Component\\Yaml\\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12."
                }
            ],
            "source": {
                "advisory": "GHSA-4qpc-3hr4-r2p4",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-14T19:13:27.727393Z",
                                "id": "CVE-2026-45304",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-14T19:13:39.323Z"
                }
            }
        ]
    }
}