CVE-2026-30754

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.

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-25)

CWE

CWE-787

Published

2026-09-08

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• ffmpeg:ffmpeg

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20746
• https://gist.github.com/momo-trip/4cddf2c9e15600873de55259dac6b0e6
• https://github.com/momo-trip/poc_ffmpeg

Check your stackJSON