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CVE-2026-64835— FFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder

Quick assessment

Affected
FFmpeg FFmpeg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 4.4版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于ADX音频解码器中libavcodec/adxdec.c存在越界内存访问问题，当mid-stream通道布局变化时，adx_decode_frame函数重新解析流头部但未能更新内部通道状态，导致后续解码操作使用过时的通道计数访问prev[]状态数组，可触发越界读取和越界写入。

CVSS 8.8 · High EPSS 0.50% · P41

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 4.4≤ 8.1.2 affected
1836ef96846937a6cc2443698a693104f5c0b21e affected
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I. Basic Information for CVE-2026-64835

Vulnerability Information
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Vulnerability Title
FFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 4.4版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于ADX音频解码器中libavcodec/adxdec.c存在越界内存访问问题，当mid-stream通道布局变化时，adx_decode_frame函数重新解析流头部但未能更新内部通道状态，导致后续解码操作使用过时的通道计数访问prev[]状态数组，可触发越界读取和越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 4.4 ~ 8.1.2 -

II. Public POCs for CVE-2026-64835

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III. Intelligence Information for CVE-2026-64835

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Patches & Fixes for CVE-2026-64835 (2)

Vendor Advisories for CVE-2026-64835 (1)

Same Patch Batch · FFmpeg · 2026-07-22 · 6 CVEs total

CVE-2026-64831 8.8 HIGH FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder
CVE-2026-64830 8.8 HIGH FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer
CVE-2026-64832 8.8 HIGH FFmpeg 4.4 - 8.1.2 Double-Free in NVDEC Hardware Decoder via nvdec.c
CVE-2026-64834 7.5 HIGH FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer
CVE-2026-64833 7.1 HIGH FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-787

V. Comments for CVE-2026-64835

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