In devs.c in Yubico libu2f-host before 1.1.8, the response to init is misparsed, leaking uninitialized stack memory back to the device.
{ "binaries": [ { "binary_name": "libu2f-host-dev", "binary_version": "1.1.4-1ubuntu0.1" }, { "binary_name": "libu2f-host0", "binary_version": "1.1.4-1ubuntu0.1" }, { "binary_name": "libu2f-udev", "binary_version": "1.1.4-1ubuntu0.1" }, { "binary_name": "u2f-host", "binary_version": "1.1.4-1ubuntu0.1" } ] }