High severity · published Sep 8, 2026
CVE-2026-30754
A memory corruption vulnerability exists in FFmpeg before 8.1
8.8
CVSS
0.5%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FF
Ffmpeg · Ffmpeg
before 8.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30754
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-30754
Issue Tracking
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20746
Third Party Advisory
https://gist.github.com/momo-trip/4cddf2c9e15600873de55259dac6b0e6
Exploit
https://github.com/momo-trip/poc_ffmpeg
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