Medium severity · published Oct 8, 2026
CVE-2026-107678
FFmpeg through 9.0.2 Stack Exhaustion via Recursive Free of pssh Boxes
4.7
CVSS
0.1%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 1% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FF
FFmpeg · FFmpeg
through 9.0.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107678
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107678
issue-tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24593
technical-description
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/encryption_info.c#L219-L231
technical-description
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/mov.c#L8070
product
https://ffmpeg.org/
third-party-advisory
https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-stack-exhaustion-via-recursive-free-of-pssh-boxes
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