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… (CVE-2026-64835)

CVE-2026-64835 affects FFmpeg versions from 4.4 up to and including 8.1.2. The vulnerability is an out-of-bounds memory access in the ADX audio decoder component (libavcodec/adxdec.c). It is triggered by a crafted ADX or AAX audio file that includes a mid-stream channel layout change, causing improper handling of internal channel state. This leads to out-of-bounds reads and writes during decoding, which can result in memory corruption. The vulnerability is classified under CWE-787 (Out-of-bounds Write). The CVSS v3.1 base score is 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H), indicating network exploitable with low attack complexity, no privileges required, user interaction needed, and high impact on confidentiality, integrity, and availability. Multiple affected versions are explicitly listed, including various Ubuntu package versions. A patch is available for this vulnerability.

Successful exploitation of this vulnerability can lead to out-of-bounds memory reads and writes, potentially causing memory corruption, application crashes, or arbitrary code execution. The CVSS score of 8.8 reflects a high impact on confidentiality, integrity, and availability of affected systems. No known exploits in the wild have been reported at this time.

A patch is available for this vulnerability. Users and administrators should apply the official FFmpeg updates or relevant distribution patches that address CVE-2026-64835. Since this is a software vulnerability in FFmpeg, updating to a fixed version is the recommended mitigation. No vendor advisory indicating 'no action required' or 'already mitigated' is provided, so timely patching is advised.