FFmpeg 5.0 through 9.0.2 Path Traversal via IMF Demuxer ASSETMAP Path

Advisories

FFmpeg 5.0 through 9.0.2 Path Traversal via IMF Demuxer ASSETMAP Path

Severity: medium
Date: 10/31/2026
Affecting: FFmpeg >= 5.0, <= 9.0.2
CVE: CVE-2026-120210
CWE: CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS: 5.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
References: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25341
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/imfdec.c#L273
https://github.com/FFmpeg/FFmpeg
Credit: BapToutatis
Description: FFmpeg 5.0 through 9.0.2 contains a path traversal vulnerability in the IMF demuxer that allows attackers to open files outside the package via unvalidated ASSETMAP Path elements. Attackers can supply a crafted IMF package with '..' or absolute paths to demux local MXF files, probe file existence and size, or trigger server-side requests.

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