Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-45304

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, Symfony\Component\Yaml\Parser resolved YAML collection aliases recursively, allowing a small untrusted YAML input to expand into a multi-gigabyte structure and exhaust memory. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.008
EPSS Ranking 51.1%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-45304


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