Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ffmpeg | Ffmpeg | <= 8.1.2 |
Related Weaknesses (CWE)
References
- https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/de771bd52774a52d45b0e2c82e56995a1efPatch
- https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23767Issue TrackingPatch
- https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-via-ty-demuxer-aThird Party Advisory
FAQ
What is CVE-2026-65704?
CVE-2026-65704 is a vulnerability with a CVSS score of 7.8 (HIGH). 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...
How severe is CVE-2026-65704?
CVE-2026-65704 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-65704?
Check the references section above for vendor advisories and patch information. Affected products include: Ffmpeg Ffmpeg.