CVE-2026-64835Network attack vector

Memory corruption via stale ADX channel state

Published Jul 22, 2026 · Updated Jul 22, 2026

Out-of-bounds memory access in FFmpeg 4.4 through 8.1.2 allows attackers to read or write memory via a crafted ADX or AAX file. In libavcodec/adxdec.c, adx_decode_frame re-parses mid-stream extradata without updating channel state, then indexes prev[] with a stale channel count. A user or automated media workflow must parse the file; the resulting corruption crashes the process, discloses process memory, or enables code execution depending on memory layout and protections.

CVSS severity8.7
High
EPSS probability0.33%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds memory access in FFmpeg 4.4 through 8.1.2 allows attackers to read or write memory via a crafted ADX or AAX file. In libavcodec/adxdec.c, adx_decode_frame re-parses mid-stream extradata without updating channel state, then indexes prev[] with a stale channel count. A user or automated media workflow must parse the file; the resulting corruption crashes the process, discloses process memory, or enables code execution depending on memory layout and protections.

The record

CVE
CVE-2026-64835
Published
Jul 22, 2026
Updated
Jul 22, 2026
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1836ef96846937a6cc2443698a693104f5c0b21e
  2. Affected versionversion=4.4 <=8.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=1836ef96846937a6cc2443698a693104f5c0b21e; version=4.4 <=8.1.2

Published CVSS scores

8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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