Path Traversal in Ffmpeg
CVE-2026-120210
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25341 (issue-tracking)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/imfdec.c (technical-description)
- github.com/FFmpeg/FFmpeg (product)
- www.vulncheck.com/advisories/ffmpeg-5.0-through-9.0.2-path-traversal-via-imf-de… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120210?
- CVE-2026-120210 is a medium-severity vulnerability in Ffmpeg, classified under Path Traversal. CVSS score: 4.3/10. Published 2026-10-31.
- How severe is CVE-2026-120210?
- Medium severity. CVSS v3 base score is 4.3 out of 10.