Vulnerability Description
FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap out-of-bounds write that could enable code execution.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ffmpeg | Ffmpeg | <= 8.1.2 |
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/aafb5c655edc76a753275c383ebb139feb0Patch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23631Issue TrackingPatch
- https://www.vulncheck.com/advisories/ffmpeg-mace6-audio-decoder-heap-out-of-bounThird Party Advisory
FAQ
What is CVE-2026-66039?
CVE-2026-66039 is a vulnerability with a CVSS score of 8.8 (HIGH). FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file ...
How severe is CVE-2026-66039?
CVE-2026-66039 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-66039?
Check the references section above for vendor advisories and patch information. Affected products include: Ffmpeg Ffmpeg.