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CVE-2026-107678

4.7 · MEDIUM

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 t…

Published Oct 8, 2026ffmpegCWE-674EPSS 0.09%

Overview

CVE-2026-107678 is a medium-severity vulnerability affecting ffmpeg ffmpeg. It was published on October 8, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories and patches from ffmpeg. Update ffmpeg to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
ffmpegffmpeg0Affected

References

Refcode.ffmpeg.org/FFmpeg/FFmpeg/pulls/24593Refffmpeg.org/GitHubgithub.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/mov.c#L8070GitHubgithub.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/encryption_info.c#L219-L231Refwww.vulncheck.com/advisories/ffmpeg-through-9.0.2-stack-exhaustion-via-recursive-free-of-pssh-boxes

How CyberStrike helps

Frequently asked questions

What is CVE-2026-107678?

CVE-2026-107678 is a medium-severity vulnerability affecting ffmpeg ffmpeg. It was published on October 8, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-107678?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-107678?

Check the references section for vendor advisories and patches from ffmpeg. Update ffmpeg to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-107678?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-107678 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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