firefox: thunderbird: Cross origin video frame leak

A flaw was found in Mozilla. The Mozilla Foundation's Security Advisory describes the following issue: Video frames could have been leaked between origins in some situations...

CVE-2018-13348

The mpatchdecode function in mpatch.c in Mercurial before 4.6.1 mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not, aka OVE-20180430-0001...