Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
Google Chrome Releases reports:
4 security fixes in this release, including:
 High CVE-2016-5199: Heap corruption in FFmpeg. Credit to
 High CVE-2016-5200: Out of bounds memory access in V8. Credit to
 Medium CVE-2016-5201: Info leak in extensions. Credit to
 CVE-2016-5202: Various fixes from internal audits,
fuzzing and other initiatives