Envoy , the open source edge and service proxy designed for cloud-native applications, worked with OSTIF and X41 D-Sec to help improve the project’s security posture. The multi-phased engagement, sponsored by Google, focused first on the triaging and closing of bugs, then upon further improving the core fuzzers that continually monitor for security issues using OSS-Fuzz infrastructure at https://github.com/google/oss-fuzz. This engagement is part of a series of security efforts to improve the security and reliability of Envoy.