CVE-2026-64835 | FFmpeg versions 4.4 through 8.1.2 contain an out-of-bounds m… | CVSS 8.8 HIGH

Description

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.

Metadata

CVE ID: CVE-2026-64835
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-07-20 18:27 UTC
Published: 2026-07-22 17:24 UTC
Last updated: 2026-07-22 17:24 UTC
Primary CWE: CWE-787
Out-of-bounds Write
Vendor / Product: FFmpeg / FFmpeg
Sources: cve.org · NVD

Severity & Metrics

8.8 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
FFmpeg	FFmpeg	—	4.4 ≤ 8.1.2, 1836ef96846937a6cc2443698a693104f5c0b21e

Weakness (CWE)

CWE	Source	Description
CWE-787	cna	Out-of-bounds Write

CVSS scores (2)

Score	Severity	Version	Source	Vector
8.8	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.7	HIGH	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References (3)