Search by 
symfony/security-core Security Advisories for v2.6.6 (1)
-
[HIGH] CVE-2016-1902: SecureRandom's fallback not secure when OpenSSL fails
PKSA-cdq8-87w8-19rq CVE-2016-1902 GHSA-jjx5-fq5g-8xpc
Affected version: >=2.4.0,<2.5.0|>=2.5.0,<2.6.0|>=2.6.0,<2.6.13|>=2.7.0,<2.7.9
Reported by:
GitHub, FriendsOfPHP/security-advisories