The Mountain View, Calif.-based Adobe urged Windows and macOS users to treat the PDF Reader patch with the utmost priority, because the flaws expose machines to remote code execution and privilege escalation attacks.

The Acrobat and Reader update patches at least 19 documented vulnerabilities, all carrying the “critical” or “important” security ratings.

”Successful exploitation could lead to arbitrary code execution in the context of the current user,” Adobe warned, noting that most of the flaws are memory safety issues.