FFmpeg before 2017-01-23 has an out-of-bounds write caused by a stack-based buffer overflow related to the decode_zbuf function in libavcod…

published 2017-04-14 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-16841

cvss: 9.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 2.5%; EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits: 0; none known

FFmpeg before 2017-01-23 has an out-of-bounds write caused by a stack-based buffer overflow related to the decode_zbuf function in libavcodec/pngdec.c.

Patch / fix

distros 3 links 1

debian ubuntu opensuse

ffmpeg Debian 14, Debian 13, Debian 12 7:3.2.4-1

debian advisories DEBIAN-CVE-2017-7866

ffmpeg Ubuntu 16.04 LTS 7:2.8.11-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2017-7866

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

ffmpeg-4 openSUSE Tumbleweed 4.4-5.2
ffmpeg2 Package Hub 12 SP1 2.8.11-12.1

opensuse advisories openSUSE-SU-2024:10754-1 openSUSE-SU-2017:1532-1

github.com/FFmpeg/FFmpeg@e371f03 commit

Exploit prediction

2.51% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	9.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-787 Out-of-bounds Write

References

github.com /FFmpeg/FFmpeg/commit/e371f031b942d73e02c090170975561fabd5c264
patch, third-party-advisory
securityfocus.com /bid/97664
vdb-entry, third-party-advisory
bugs.chromium.org /p/oss-fuzz/issues/detail?id=444
third-party-advisory, vdb-entry

Sources

CVE List CVE-2017-7866
NVD CVE-2017-7866

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary