CVE-2026-30754
High
Description
A memory corruption vulnerability exists in FFmpeg before 8.1. The RTP encoding process. In the nal_send function in libavformat/rtpenc_h264_hevc.c, a negative size parameter (size=-3) is passed to memcpy when transmitting H.264/HEVC streams via RTP using a crafted input file. This was detected using AddressSanitizer.
SeverityHigh
CVSS8.8
Exploit probability—
ProductFfmpeg
PublishedSep 8, 2026
First seenSep 8, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- ffmpeg ffmpeg8.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| ffmpeg ffmpeg | v < 8.1 | 8.1 |
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