{"id":"CVE-2026-109413","revision":null,"records":[{"revision":"bce82573900b4208b72e3c357c2bf835","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-109413","aliases":[],"title":"Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process","description":"In Symfony YAML prior to versions\u00A05.4.54,\u00A06.4.45,\u00A07.4.18, and\u00A08.1.6,\u00A0Yaml\\Parser::lexInlineStructure() recursed through lexInlineMapping() and lexInlineSequence() for every { and [ of an inline collection, without entering the nesting level that the rest of the parser bounds with maxNestingLevel. A document made of deeply nested inline collections, such as [[[[...]]]], exhausted the stack while it was being lexed: depending on the PHP version and its stack settings, the process crashed or the request ended with a fatal error.\n\n\n\nAny code parsing untrusted YAML is affected. That includes #[MapRequestPayload] when the Yaml component is installed and the endpoint does not restrict acceptFormat: a single unauthenticated request with a YAML content type is enough.\n\n\n\nThis issue affects symfony/yaml\u00A0through v5.4.53, v6.0.0-BETA1 through\u00A0v6.4.44, v7.0.0-BETA1 through\u00A0v7.4.17, and v8.0.0-BETA1 through\u00A0v8.1.5.","state":0,"publishedAt":"2026-10-15T14:57:00.211+00:00","modifiedAt":"2026-10-15T18:06:55.183+00:00","affected":[{"ecosystem":"https://packagist.org/packages/symfony/yaml","name":"symfony/yaml","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"sensiolabs\",\n                    \"product\": \"symfony\",\n                    \"collectionURL\": \"https://packagist.org/packages/symfony/yaml\",\n                    \"packageName\": \"symfony/yaml\",\n                    \"repo\": \"https://github.com/symfony/yaml\",\n                    \"modules\": [\n                        \"Symfony\\\\\\\\Component\\\\\\\\Yaml\\\\\\\\Parser::lexInlineStructure()\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"0\",\n                            \"lessThan\": \"v5.4.54\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v6.0.0-BETA1\",\n                            \"lessThan\": \"v6.4.45\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v7.0.0-BETA1\",\n                            \"lessThan\": \"v7.4.18\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"v8.0.0-BETA1\",\n                            \"lessThan\": \"v8.1.6\",\n                            \"versionType\": \"git\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":8.7,"severity":"HIGH"}],"references":["https://github.com/symfony/symfony/security/advisories/GHSA-2v3c-qxhr-7vpv","https://symfony.com/blog/cve-2026-109413-unbounded-recursion-in-the-yaml-inline-lexer-lets-a-single-document-crash-the-process","https://github.com/symfony/symfony/pull/65688"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-109413","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-109413","identifiers":["CVE-2026-109413"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-09T15:04:17.9226009+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-09T15:04:17.9226009+00:00","lastSuccessAt":"2026-11-09T15:04:18.1621362+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:18.1621395+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-24e6fde7b744113daefb8f6135035fb8a5c69c9617c9c0d40574a0376532ffd3-49ad16fb0d34ddf0ae41aa46fedfe58e1df7005677e5f3c7ea3ce3ccbb1e0589","complete":true,"records":421457,"lastAttemptAt":"2026-11-09T15:02:15.2169676+00:00","lastSuccessAt":"2026-11-09T15:02:15.1121329+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:02:15.2169676+00:00","snapshotPublishedAt":"2026-11-09T14:25:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-2ed82815e1364a029cd15015e2e48cf0","complete":false,"records":13655,"lastAttemptAt":"2026-11-09T15:04:31.6169278+00:00","lastSuccessAt":"2026-11-09T15:04:31.684705+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:31.684705+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T15:04:17.9226009+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T15:04:17.9226009+00:00","lastSuccessAt":"2026-11-09T15:04:18.1628494+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:18.1628497+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-122e73413fbf41e4b6ede4e4f5660885","complete":true,"records":13667,"lastAttemptAt":"2026-11-09T15:04:19.7498555+00:00","lastSuccessAt":"2026-11-09T15:04:19.744+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:19.744+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13707,"expectedIdentifiers":13707,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-09T15:04:17.5233893+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:17.5233893+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-09T15:02:16.0914115+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:02:16.0914115+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-c905fa1bd26c7b261e77cc7202a86dc766ff31c2b096b501f3bf44f561e34970","complete":true,"records":3063,"lastAttemptAt":"2026-11-09T15:04:17.8913143+00:00","lastSuccessAt":"2026-11-09T12:02:21.7931207+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:17.8913143+00:00","snapshotPublishedAt":"2026-11-09T11:18:00+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-c5775280c9de3927e2aad763cbfbebcc2ac79b903f8410c65ab9bc1096f5fa3d","complete":true,"records":231299,"lastAttemptAt":"2026-11-09T15:04:17.3926133+00:00","lastSuccessAt":"2026-11-09T15:04:15.9950254+00:00","error":null,"lastVerifiedAt":"2026-11-09T15:04:17.3926133+00:00","snapshotPublishedAt":"2026-11-09T14:33:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}