CVE-2026-107678: FFmpeg through 9.0.2 contains a stack exhaustion vulnerability in av_encryption_init_info_free() in libavutil/

Q: How do I fix CVE-2026-107678?

ffmpeg: upgrade to newer than 9.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-107678 being exploited?

CVE-2026-107678 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-107678 affect?

CVE-2026-107678 affects ffmpeg. Severity is medium (CVSS 4.7). 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

Q: How urgent is CVE-2026-107678?

Priority 17/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2026-107678 is a medium-severity flaw (CVSS 4.7) affecting ffmpeg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-10-08
Last modified	2026-10-14

Publisher (CNA): VulnCheck · Vendor: ffmpeg

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-08 16:17 UTCPublished CVE record published
2026-10-14 23:55 UTCUpdated Record last modified

ffmpeg ffmpeg UPGRADE

Affected: <= 9.0.2

Fixed in: newer than 9.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ffmpeg || rpm -q ffmpeg || ffmpeg --version

2. UPGRADE to newer than 9.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ffmpeg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ffmpeg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-107678?

ffmpeg: upgrade to newer than 9.0.2. Exact commands for each OS are on this page.

Is CVE-2026-107678 being exploited?

CVE-2026-107678 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-107678 affect?

CVE-2026-107678 affects ffmpeg. Severity is medium (CVSS 4.7). 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

How urgent is CVE-2026-107678?

Priority 17/100. No elevated risk signals yet.

Software pages

FFmpeg vulnerabilities

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References

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