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Symfony's YAML Parser has a ReDoS via Catastrophic Backtracking in Parser::cleanup() Regex

🗓️ 27 May 2026 21:34:35Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 34 Views

Symfony YAML parser ReDoS in Parser::cleanup() from regex backtracking; fixed with possessive quantifiers.

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Detection
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Vulners
Node
symfonyyamlRange8.0.08.0.12composer
OR
symfonyyamlRange7.0.07.4.12composer
OR
symfonyyamlRange6.0.06.4.40composer
OR
symfonysymfonyRange8.0.08.0.12composer
OR
symfonysymfonyRange7.0.07.4.12composer
OR
symfonysymfonyRange6.0.06.4.40composer
OR
symfonysymfonyRange<5.4.52composer
OR
symfonyyamlRange<5.4.52composer

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27 May 2026 21:34Current
5.8Medium risk
Vulners AI Score5.8
EPSS0.00076
34