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.

CVSS 4.0

5.7CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

4.7CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS

0.09% chance of exploitation in the next 30 days; higher than 0% of CVEs (scores of 2026-10-25)

CWE

CWE-674

Published

2026-10-08

Modified

2026-10-14

Record from

the NVD, synced 2026-10-19

Affected

• ffmpeg:ffmpeg

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24593
• https://ffmpeg.org/
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/mov.c#L8070
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/encryption_info.c#L219-L231
• https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-stack-exhaustion-via-recursive-free-of-pssh-boxes

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