Incorrect object lifecycle in MediaRecorder in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.
https://www.debian.org/security/2018/dsa-4352
https://security.gentoo.org/glsa/201908-18
https://chromereleases.googleblog.com/2018/12/stable-channel-update-for-desktop.html