What’s Vulnerable › Vulnerabilities

CVE-2026-30754

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-08 · updated 2026-10-15
• Weakness: CWE-787

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 products

• FFmpeg: before 8.1 — fixed in 8.1

How to fix

Upgrade to a fixed version: FFmpeg 8.1. Check the vendor advisory for mitigations.

References

• 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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