WebRTC can use a `WrappedI420Buffer` pixel buffer but the owning image object can be freed while it is still in use. This can result in the WebRTC encoder using uninitialized memory, leading to a potentially exploitable crash. External Reference: https://www.mozilla.org/en-US/security/advisories/mfsa2018-11/#CVE-2018-5160
Acknowledgments: Name: the Mozilla project Upstream: Andreas Perhson