CVE-2026-64835: Ffmpeg

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

FFmpeg versions 4.4 through 8.1.2 contain an out-of-bounds memory access vulnerability in the ADX audio decoder within libavcodec/adxdec.c that allows attackers to trigger both out-of-bounds reads and writes by supplying a crafted ADX or AAX audio file with a mid-stream channel layout change. When AV_PKT_DATA_NEW_EXTRADATA side data is received mid-stream, the adx_decode_frame function re-parses the stream header but fails to update the internal channel state, causing subsequent decoding operations to access the prev[] state array using a stale channel count.

Affected products

• Ffmpeg Ffmpeg: from 4.4, up to and including 8.1.2

Published 2026-07-22. Last modified 2026-07-28.