CVE-2015-6818

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2015-09-06 · updated 2026-06-17
Weakness: CWE-17

Description

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

Canonical Ubuntu Linux: 12.04
FFmpeg: through 2.7.1

References

http://ffmpeg.org/security.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=47f4e2d8960ca756ca153ab8e3e93d80449b8c91
http://www.securitytracker.com/id/1033483
http://www.ubuntu.com/usn/USN-2944-1
https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html
http://ffmpeg.org/security.html
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=47f4e2d8960ca756ca153ab8e3e93d80449b8c91
http://www.securitytracker.com/id/1033483
http://www.ubuntu.com/usn/USN-2944-1
https://lists.debian.org/debian-lts-announce/2018/12/msg00009.html

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