CVE-2026-65703: FFmpeg versions 2.7 through 8.1.2 contain an out-of-bounds write vulnerability in the TDSC video decoder that

Routine

HIGH 7.8UPGRADE

CVE-2026-65703 is a high-severity flaw (CVSS 7.8) affecting ffmpeg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FFmpeg versions 2.7 through 8.1.2 contain an out-of-bounds write vulnerability in the TDSC video decoder that allows remote attackers to cause heap corruption by supplying a crafted AVI file that changes frame dimensions across TDSF frames. The tdsc_parse_tdsf() function fails to unreference the existing reference frame before calling av_frame_get_buffer(), causing tdsc_blit() and tdsc_yuv2rgb() to write attacker-controlled pixel data beyond the

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-07-23
Last modified	2026-10-24

Publisher (CNA): VulnCheck · Vendor: ffmpeg

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-23 20:17 UTCPublished CVE record published
2026-10-24 15:10 UTCUpdated Record last modified

ffmpeg ffmpeg UPGRADE

Affected: >= 2.7 and <= 8.1.2

Fixed in: newer than 8.1.2

Safe to downgrade to: a release before 2.7

1. Check installed version

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

2. UPGRADE to newer than 8.1.2 (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.

3. If no update is available yet, DOWNGRADE to a release before 2.7 (Debian / Ubuntu)

apt-cache madison ffmpeg sudo apt install ffmpeg=<VERSION_BEFORE_2.7> sudo apt-mark hold ffmpeg

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ffmpeg sudo dnf downgrade ffmpeg-<VERSION_BEFORE_2.7> sudo dnf versionlock add ffmpeg

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · sugar-clock · FIXED · 22.1-17.fc46 · FEDORA-2026-57948849df · source

sudo dnf upgrade --advisory=FEDORA-2026-57948849df

Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source

sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2

Ubuntu 20.04 · ffmpeg · FIXED · 7:4.2.7-0ubuntu0.1+esm16

sudo apt update && sudo apt install --only-upgrade ffmpeg dpkg --compare-versions "$(dpkg-query -W -f='${Version}' ffmpeg)" ge "7:4.2.7-0ubuntu0.1+esm16" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · ffmpeg · FIXED · 7:4.4.2-0ubuntu0.22.04.1+esm15

sudo apt update && sudo apt install --only-upgrade ffmpeg dpkg --compare-versions "$(dpkg-query -W -f='${Version}' ffmpeg)" ge "7:4.4.2-0ubuntu0.22.04.1+esm15" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · ffmpeg · FIXED · 7:6.1.1-3ubuntu5+esm13

sudo apt update && sudo apt install --only-upgrade ffmpeg dpkg --compare-versions "$(dpkg-query -W -f='${Version}' ffmpeg)" ge "7:6.1.1-3ubuntu5+esm13" && echo PATCHED || echo STILL-VULNERABLE

Debian 12 · ffmpeg · NO FIX YET

Debian 13 · ffmpeg · NO FIX YET

RHEL AI (RHEL AI) 3 · ffmpeg · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/bootc-aws-cuda-rhel9 · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/bootc-azure-cuda-rhel9 · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/bootc-azure-rocm-rhel9 · DEFERRED

RHEL AI (RHEL AI) 3 · rhelai3/bootc-cuda-rhel9 · DEFERRED

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-2026-65703?

ffmpeg: upgrade to newer than 8.1.2. Exact commands for each OS are on this page.

Is CVE-2026-65703 being exploited?

CVE-2026-65703 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-2026-65703 affect?

CVE-2026-65703 affects ffmpeg. Severity is high (CVSS 7.8). FFmpeg versions 2.7 through 8.1.2 contain an out-of-bounds write vulnerability in the TDSC video decoder that allows remote attackers to cause heap corruption by supplying a crafted AVI file that changes frame dimensions across TDSF frames.

How urgent is CVE-2026-65703?

Priority 32/100. High severity

Software pages

FFmpeg vulnerabilities

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References

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