An issue was discovered in Linaro LAVA before 2018.5.post1. Because of use of yaml.load() instead of yaml.safe_load() when parsing user data, remote code execution can occur.
https://www.debian.org/security/2018/dsa-4234
https://git.linaro.org/lava/lava.git/commit/?id=583666c84ea2f12797a3eb71392bcb05782f5b14