{"id":"GHSA-4qpc-3hr4-r2p4","summary":"Symfony's YAML Parser Vulnerable to Exponential Memory Allocation via Recursive Collection-Alias Expansion (\"Billion Laughs\")","details":"### Description\n\n`Symfony\\Component\\Yaml\\Parser` resolves YAML aliases (`*anchor`) during parsing. Aliases that reference *collections* (arrays, `stdClass`, `TaggedValue`-wrapped collections) can themselves point to other collections containing aliases, creating exponential expansion at resolution time. A small input can blow up into a multi-gigabyte structure and exhaust memory: the classic \"Billion Laughs\" denial-of-service against any parser exposed to untrusted YAML.\n\n### Resolution\n\nThe `Parser` now counts collection alias resolutions in a shared `ParserState` object, with a default limit of **128**, following the [SnakeYAML model](https://github.com/snakeyaml/snakeyaml/blob/master/src/main/java/org/yaml/snakeyaml/LoaderOptions.java). Scalar aliases remain unrestricted since they cannot drive exponential growth. The limit is configurable via a new `$maxAliasesForCollections` argument on `Parser::__construct()`, `Yaml::parse()` and `Yaml::parseFile()`. A new `Yaml::PARSE_EXCEPTION_ON_ALIAS` flag also rejects all aliases outright when parsing fully untrusted input.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a) for branch 5.4.\n\n### Credits\n\nSymfony would like to thank Pietro Tirenna (Shielder) for reporting the issue and Nicolas Grekas for fixing it.","aliases":["CVE-2026-45304"],"modified":"2026-09-10T03:50:45.630970551Z","published":"2026-05-27T21:33:50Z","database_specific":{"nvd_published_at":null,"cwe_ids":["CWE-776"],"severity":"LOW","github_reviewed":true,"github_reviewed_at":"2026-05-27T21:33:50Z"},"references":[{"type":"WEB","url":"https://github.com/symfony/symfony/security/advisories/GHSA-4qpc-3hr4-r2p4"},{"type":"WEB","url":"https://github.com/symfony/symfony/commit/e77391b2e4f18821198f010d573674c8ed4a970a"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45304.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/yaml/CVE-2026-45304.yaml"},{"type":"PACKAGE","url":"https://github.com/symfony/symfony"},{"type":"WEB","url":"https://symfony.com/cve-2026-45304"}],"affected":[{"package":{"name":"symfony/yaml","ecosystem":"Packagist","purl":"pkg:composer/symfony/yaml"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.52"}]}],"versions":["2.0.4","2.0.5","2.0.6","2.0.7","v2.0.10","v2.0.12","v2.0.13","v2.0.14","v2.0.15","v2.0.16","v2.0.17","v2.0.18","v2.0.19","v2.0.20","v2.0.21","v2.0.22","v2.0.23","v2.0.24","v2.0.25","v2.0.9","v2.1.0","v2.1.1","v2.1.10","v2.1.11","v2.1.12","v2.1.13","v2.1.2","v2.1.3","v2.1.4","v2.1.5","v2.1.6","v2.1.7","v2.1.8","v2.1.9","v2.2.0","v2.2.1","v2.2.10","v2.2.11","v2.2.2","v2.2.3","v2.2.4","v2.2.5","v2.2.6","v2.2.7","v2.2.8","v2.2.9","v2.3.0","v2.3.1","v2.3.10","v2.3.11","v2.3.12","v2.3.13","v2.3.14","v2.3.15","v2.3.16","v2.3.17","v2.3.18","v2.3.19","v2.3.2","v2.3.20","v2.3.21","v2.3.22","v2.3.23","v2.3.24","v2.3.25","v2.3.26","v2.3.27","v2.3.28","v2.3.29","v2.3.3","v2.3.30","v2.3.31","v2.3.32","v2.3.33","v2.3.34","v2.3.35","v2.3.36","v2.3.37","v2.3.38","v2.3.39","v2.3.4","v2.3.40","v2.3.41","v2.3.42","v2.3.5","v2.3.6","v2.3.7","v2.3.8","v2.3.9","v2.4.0","v2.4.0-BETA1","v2.4.0-BETA2","v2.4.0-RC1","v2.4.1","v2.4.10","v2.4.2","v2.4.3","v2.4.4","v2.4.5","v2.4.6","v2.4.7","v2.4.8","v2.4.9","v2.5.0","v2.5.0-BETA1","v2.5.0-BETA2","v2.5.0-RC1","v2.5.1","v2.5.10","v2.5.11","v2.5.12","v2.5.2","v2.5.3","v2.5.4","v2.5.5","v2.5.6","v2.5.7","v2.5.8","v2.5.9","v2.6.0","v2.6.0-BETA1","v2.6.0-BETA2","v2.6.1","v2.6.10","v2.6.11","v2.6.12","v2.6.13","v2.6.2","v2.6.3","v2.6.4","v2.6.5","v2.6.6","v2.6.7","v2.6.8","v2.6.9","v2.7.0","v2.7.0-BETA1","v2.7.0-BETA2","v2.7.1","v2.7.10","v2.7.11","v2.7.12","v2.7.13","v2.7.14","v2.7.15","v2.7.16","v2.7.17","v2.7.18","v2.7.19","v2.7.2","v2.7.20","v2.7.21","v2.7.22","v2.7.23","v2.7.24","v2.7.25","v2.7.26","v2.7.27","v2.7.28","v2.7.29","v2.7.3","v2.7.30","v2.7.31","v2.7.32","v2.7.33","v2.7.34","v2.7.35","v2.7.36","v2.7.37","v2.7.38","v2.7.39","v2.7.4","v2.7.40","v2.7.41","v2.7.42","v2.7.43","v2.7.44","v2.7.45","v2.7.46","v2.7.47","v2.7.48","v2.7.49","v2.7.5","v2.7.50","v2.7.51","v2.7.6","v2.7.7","v2.7.8","v2.7.9","v2.8.0","v2.8.0-BETA1","v2.8.1","v2.8.10","v2.8.11","v2.8.12","v2.8.13","v2.8.14","v2.8.15","v2.8.16","v2.8.17","v2.8.18","v2.8.19","v2.8.2","v2.8.20","v2.8.21","v2.8.22","v2.8.23","v2.8.24","v2.8.25","v2.8.26","v2.8.27","v2.8.28","v2.8.29","v2.8.3","v2.8.30","v2.8.31","v2.8.32","v2.8.33","v2.8.34","v2.8.35","v2.8.36","v2.8.37","v2.8.38","v2.8.39","v2.8.4","v2.8.40","v2.8.41","v2.8.42","v2.8.43","v2.8.44","v2.8.45","v2.8.46","v2.8.47","v2.8.48","v2.8.49","v2.8.5","v2.8.50","v2.8.52","v2.8.6","v2.8.7","v2.8.8","v2.8.9","v3.0.0","v3.0.0-BETA1","v3.0.1","v3.0.2","v3.0.3","v3.0.4","v3.0.5","v3.0.6","v3.0.7","v3.0.8","v3.0.9","v3.1.0","v3.1.0-BETA1","v3.1.0-RC1","v3.1.1","v3.1.10","v3.1.2","v3.1.3","v3.1.4","v3.1.5","v3.1.6","v3.1.7","v3.1.8","v3.1.9","v3.2.0","v3.2.0-BETA1","v3.2.0-RC1","v3.2.0-RC2","v3.2.1","v3.2.10","v3.2.11","v3.2.12","v3.2.13","v3.2.14","v3.2.2","v3.2.3","v3.2.4","v3.2.5","v3.2.6","v3.2.7","v3.2.8","v3.2.9","v3.3.0","v3.3.0-BETA1","v3.3.0-RC1","v3.3.1","v3.3.10","v3.3.11","v3.3.12","v3.3.13","v3.3.14","v3.3.15","v3.3.16","v3.3.17","v3.3.18","v3.3.2","v3.3.3","v3.3.4","v3.3.5","v3.3.6","v3.3.7","v3.3.8","v3.3.9","v3.4.0","v3.4.0-BETA1","v3.4.0-BETA2","v3.4.0-BETA3","v3.4.0-BETA4","v3.4.0-RC1","v3.4.0-RC2","v3.4.1","v3.4.10","v3.4.11","v3.4.12","v3.4.13","v3.4.14","v3.4.15","v3.4.16","v3.4.17","v3.4.18","v3.4.19","v3.4.2","v3.4.20","v3.4.21","v3.4.22","v3.4.23","v3.4.24","v3.4.25","v3.4.26","v3.4.27","v3.4.28","v3.4.29","v3.4.3","v3.4.30","v3.4.31","v3.4.32","v3.4.33","v3.4.34","v3.4.35","v3.4.36","v3.4.37","v3.4.38","v3.4.39","v3.4.4","v3.4.40","v3.4.41","v3.4.42","v3.4.43","v3.4.44","v3.4.45","v3.4.46","v3.4.47","v3.4.5","v3.4.6","v3.4.7","v3.4.8","v3.4.9","v4.0.0","v4.0.0-BETA1","v4.0.0-BETA2","v4.0.0-BETA3","v4.0.0-BETA4","v4.0.0-RC1","v4.0.0-RC2","v4.0.1","v4.0.10","v4.0.11","v4.0.12","v4.0.13","v4.0.14","v4.0.15","v4.0.2","v4.0.3","v4.0.4","v4.0.5","v4.0.6","v4.0.7","v4.0.8","v4.0.9","v4.1.0","v4.1.0-BETA1","v4.1.0-BETA2","v4.1.0-BETA3","v4.1.1","v4.1.10","v4.1.11","v4.1.12","v4.1.2","v4.1.3","v4.1.4","v4.1.5","v4.1.6","v4.1.7","v4.1.8","v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