Implementation error in QUIC Networking in Google Chrome prior to 72.0.3626.81 allowed an attacker running or able to cause use of a proxy server to obtain cleartext of transport encryption via malicious network proxy.
https://www.debian.org/security/2019/dsa-4395
https://chromereleases.googleblog.com/2019/01/stable-channel-update-for-desktop.html