CVE-2026-109413

CVE-2026-109413 · Symfony: Unbounded Recursion in the YAML Inline Lexer Lets a Single Document Crash the Process

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In Symfony YAML prior to versions 5.4.54, 6.4.45, 7.4.18, and 8.1.6, Yaml\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. Any 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. This issue affects symfony/yaml through v5.4.53, v6.0.0-BETA1 through v6.4.44, v7.0.0-BETA1 through v7.4.17, and v8.0.0-BETA1 through v8.1.5.

CVSS 8.7 · Élevée · EPSS 0,4% · Correctif disponible

Publication

2026-10-15T14:57:00.211Z

Mise à jour

2026-10-15T18:06:55.183Z

Pile logicielle: system · php

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