CVE-2015-6818: Canonical Ubuntu Linux
High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.
The decode_ihdr_chunk function in libavcodec/pngdec.c in FFmpeg before 2.7.2 does not enforce uniqueness of the IHDR (aka image header) chunk in a PNG image, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via a crafted image with two or more of these chunks.
Affected products
Published 2015-09-06. Last modified 2026-06-17.