Use of unsafe yaml load was fixed in ros-actionlib.

For Debian 9 stretch, this problem has been fixed in version 1.11.7-1+deb9u1.

We recommend that you upgrade your ros-actionlib packages.

For the detailed security status of ros-actionlib please refer to its security tracker page at: https://security-tracker.debian.org/tracker/ros-actionlib

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS