What’s Vulnerable › Vulnerabilities

CVE-2026-107678: FFmpeg through 9.0.2 Stack Exhaustion via Recursive Free of pssh Boxes

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-14
• Weakness: CWE-674

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.

Affected products

• FFmpeg: through 9.0.2

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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