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FFmpeg CVE-2026-64835

| EUVDEUVD-2026-47760 HIGH
Out-of-bounds Write (CWE-787)
2026-07-22 VulnCheck GHSA-p2v8-4c4f-rwpq
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.8 HIGH

Malicious file is delivered remotely (AV:N) but the victim must decode it (UI:R); no auth needed (PR:N); OOB write enables memory corruption with high C/I/A.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
7.8 HIGH
AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat
8.8 HIGH
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 22, 2026 - 18:02 vuln.today
CVE Published
Jul 22, 2026 - 17:24 cve.org
HIGH 8.7

DescriptionCVE.org

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.

AnalysisAI

Out-of-bounds read and write in the FFmpeg ADX audio decoder (libavcodec/adxdec.c) affects versions 4.4 through 8.1.2, where a mid-stream channel layout change corrupts memory. When AV_PKT_DATA_NEW_EXTRADATA side data arrives mid-stream, adx_decode_frame re-parses the header but leaves the internal channel state stale, so later decode operations index the prev[] state array with a wrong channel count. There is no public exploit identified at time of analysis and it is not listed in CISA KEV, but the flaw enables both reads and writes and carries a CVSS 4.0 base score of 8.7.

Technical ContextAI

FFmpeg's libavcodec is the near-universal library used for media decoding across players, transcoders, browsers, and server-side pipelines. The affected component is the CRI ADX/AAX audio decoder (adxdec.c), a format common in video-game audio. The root cause is CWE-787 (Out-of-bounds Write): the decoder maintains per-channel predictor history in a prev[] array sized to the original channel count, and when a new extradata block re-parses the stream header mid-stream, the channel-count variable governing subsequent prev[] accesses is not synchronized, so a smaller-to-larger (or otherwise changed) channel layout drives indexing beyond the allocated bounds - yielding both out-of-bounds reads and writes.

RemediationAI

Upstream fix available (PR/commit); released patched version not independently confirmed - apply the FFmpeg patch commit 1836ef96846937a6cc2443698a693104f5c0b21e (PR https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23659) or upgrade to a build that incorporates it once tagged. Until a fixed release is deployed, compensating controls include disabling or removing the ADX/AAX decoder from the FFmpeg build (via --disable-decoder=adpcm_adx or equivalent codec allow-listing) if your workflow does not need CRI game audio, which eliminates the vulnerable code path at the cost of losing ADX/AAX support; and restricting decoding to trusted input by validating or sandboxing (seccomp/container isolation) any pipeline that processes user-supplied media, which contains rather than prevents the corruption. Reference the VulnCheck advisory (https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-memory-access-in-adx-audio-decoder) for confirmation of affected versions.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Leap 16.0 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP4-LTSS Affected

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CVE-2026-64835 vulnerability details – vuln.today

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