CVE-2019-3561
Insufficient boundary checks for the strrpos and strripos functions allow access to out-of-bounds memory. This affects all supported versions of HHVM (4.0.3, 3.30.4, and 3.27.7 and below).
Date published : 2019-04-29
https://github.com/facebook/hhvm/commit/46003b4ab564b2abcd8470035fc324fe36aa8c75