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GHSA-4QPC-3HR4-R2P4 Symfony's YAML Parser Vulnerable to Exponential Memory Allocation via Recursive Collection-Alias Expansion ("Billion Laughs")

🗓️ 27 May 2026 21:33:50Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 5 Views

Symfony YAML parser is vulnerable to Billion Laughs via collection alias expansion; a 128 alias limit is configurable.

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08 Jun 2026 18:44Current
5.8Medium risk
Vulners AI Score5.8
CVSS 46.9
EPSS0.00076
5