Vulnerability in Ffmpeg
CVE-2026-107678
FFmpeg through 9.0.2 contains a stack exhaustion vulnerability in av_encryption_init_info_free() in libavutil/encryption_info.c, which recursively frees AVEncryptionInitInfo linked lists built by the MOV demuxer's mov_read_pssh(). Attackers can supply a crafted MP4 file with tens of thousands of small pssh boxes to exhaust the stack and crash the process, while also causing quadratic CPU consumption.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.
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/24593 (issue-tracking)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/encryption_info.c (technical-description)
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/mov.c (technical-description)
- ffmpeg.org/ (product)
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-stack-exhaustion-via-recursiv… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-107678?
- CVE-2026-107678 is a medium-severity vulnerability in Ffmpeg, classified under Uncontrolled Recursion. CVSS score: 4.7/10. Published 2026-10-08.
- How severe is CVE-2026-107678?
- Medium severity. CVSS v3 base score is 4.7 out of 10.