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FfmpegApplication

CVE-2026-65704

HIGH · 7.8 CVSS v3.1 Published 2026-07-23
Fix available
A fix is available. Upgrade to after 8.1.2 or later.
See remediation →
81/100
Remediation priority · High
No privileges 4 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
FFmpeg through 8.1.2 contains an out-of-bounds write vulnerability that allows attackers to cause heap corruption by supplying a crafted ffconcat file processed with the -safe 0 flag. The TY demuxer's demux_audio() function decrements packet size without bounds checking, producing a negative size value that is passed to memcpy() in shorten_decode_frame(), where conversion to size_t wraps the value to near SIZE_MAX and triggers reads beyond the source allocation and writes far beyond the Shorten decoder's bitstream buffer.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
FfmpegApplication
Affected:<= 8.1.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 8.1.2
Recommended fix Moderate confidence

FFmpeg 8.1.3 or later (latest stable release)

  1. 1. Identify the current FFmpeg version by running 'ffmpeg -version'
  2. 2. Check the official FFmpeg release notes or security advisory for CVE-2026-65704 to confirm the exact fixed version
  3. 3. Obtain the latest stable FFmpeg release from the official website (ffmpeg.org) or your distribution's package repository
  4. 4. Remove the currently installed FFmpeg version
  5. 5. Install the fixed FFmpeg version (typically a version higher than 8.1.2)
  6. 6. Verify the installation by running 'ffmpeg -version' to confirm the new version is installed
  7. 7. Test critical video processing workflows to ensure functionality is intact
Caveat Minor: Ensure any custom FFmpeg scripts or tools using the TY demuxer with -safe 0 are retested, as internal decoder changes may affect edge case behavior

Generated from the published advisory — verify against the referenced sources before acting.

We can identify the exact fixed release, upgrade, and verify it in staging — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-65704 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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