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.

Scoring

Severity

HIGH

CVSS base score

8.7

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

EPSS probability

0.68%

CWE

CWE-776

Published

2026-07-14

Last modified

2026-07-14

Affected products

• symfony symfony
• symfony symfony
• symfony symfony
• symfony symfony
• symfony yaml
• symfony yaml
• symfony yaml
• symfony yaml

Weakness type

• CWE-776

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