FFmpeg through 9.0.2 Heap Buffer Overflow via VideoToolbox Encoder
Affects FFmpeg through 9.0.2 when transcoding with VideoToolbox encoders without rescaling, and the input resolution grows mid-stream.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fix or patch referenced
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. FFmpeg version through 9.0.2 Transcoding with VideoToolbox encoders Input resolution grows mid-stream
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 12/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in libavcodec/videotoolboxenc.c that copies frames larger than encoder dimensions into undersized CVPixelBuffers. Attackers can supply crafted input whose resolution grows mid-stream, transcoded with VideoToolbox encoders without rescaling, to crash the application or corrupt memory.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure5/25Specific setups only
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.3/10CVSS 7.3
- No patch0/5No signal
What would change the score
- Would score about 62 if added to CISA KEV
- Would score about 57 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
FFmpeg version through 9.0.2 Transcoding with VideoToolbox encoders Input resolution grows mid-streamApply the patch listed under Evidence.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- FFmpeg FFmpeg
through 9.0.2
Evidence 5
- Patch
- Report
- Repository
- Repository
- Link
Corrections
None so far.
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Questions about CVE-2026-125212
Is CVE-2026-125212 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A heap buffer overflow occurs when frames larger than the encoder dimensions are copied into undersized CVPixelBuffers. This can crash the application or corrupt memory.Source: vulncheck.com
Which versions are affected by CVE-2026-125212?
FFmpeg: through 9.0.2.Source: cve.now feed data
Am I affected, and how do I check?
FFmpeg versions through 9.0.2 are affected in the setup where video is transcoded with VideoToolbox encoders without rescaling and the input resolution grows mid-stream. To check a installation, run ffmpeg -version to see the version and review whether the command uses a VideoToolbox encoder without a rescaling step.Source: vulncheck.com
How do I fix CVE-2026-125212?
The checked facts do not list a fixed FFmpeg version, so no specific upgrade target can be named from them. Check the FFmpeg project's advisory for a fixed release.Source: vulncheck.com