CVE-2026-109413 | SensioLabs Symfony up to 5.4.53/6.4.44/7.4.17/8.1.5 Yaml lexInlineStructure stack-based overflow

October 15, 2026 Yanac

A vulnerability, which was classified as problematic, was found in SensioLabs Symfony up to 5.4.53/6.4.44/7.4.17/8.1.5. Affected by this issue is the function YamlParser::lexInlineStructure of the component Yaml. Such manipulation leads to stack-based buffer overflow.

This vulnerability is traded as CVE-2026-109413. The attack may be launched remotely. There is no exploit available.

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