Adobe Flash Player versions 29.0.0.171 and earlier have a Stack-based buffer overflow vulnerability. Successful exploitation could lead to arbitrary code execution in the context of the current user.
https://security.gentoo.org/glsa/201806-02
https://helpx.adobe.com/security/products/flash-player/apsb18-19.html
https://access.redhat.com/errata/RHSA-2018:1827