system
Provide references for <CVE-2019-3556>.
user
Where can I find more information about <CVE-2019-3556>?
assistant
References are available at: https://hhvm.com/blog/2020/11/12/security-update.html, https://github.com/facebook/hhvm/commit/abe0b29e4d3a610f9bc920b8be4ad8403364c2d4, https://www.facebook.com/security/advisories/cve-2019-3556.