Vulnerability · Published Sep 8, 2026 · Assigned by mitre
CVE-2026-30754
High 8.8
In plain English
A high-severity out-of-bounds write in the ffmpeg package (Debian). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ffmpeg | 7:5.1.8-0+deb12u1 | DEBIAN-CVE-2026-30754 |
| Debian:13 | ffmpeg | 7:7.1.3-0+deb13u1 | DEBIAN-CVE-2026-30754 |
| Debian:14 | ffmpeg | 7:8.0.1-2 | DEBIAN-CVE-2026-30754 |
Affected products (as reported)
Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H