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Vulnerability record · CVE-2026-30754 · published 8 September 2026

CVE-2026-30754: Out-of-bounds write vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.51% · top 58.7% CWE-787 · Out-of-bounds write Awaiting Analysis
8.8CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
9 Sep 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-30754), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.