CVE-2018-6406: Webmproject Libwebm

High severity, CVSS 8.8. EPSS: 2% chance of exploitation in the next 30 days.

The function ParseVP9SuperFrameIndex in common/libwebm_util.cc in libwebm through 2018-01-30 does not validate the child_frame_length data obtained from a .webm file, which allows remote attackers to cause an information leak or a denial of service (heap-based buffer over-read and later out-of-bounds write), or possibly have unspecified other impact.

Affected products

• Webmproject Libwebm: up to and including 2018-01-30

Published 2018-01-30. Last modified 2026-06-17.