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CVE-2026-64833— FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c

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 0.7.1版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于S/PDIF muxer缺少边界检查，允许攻击者提供特制的DTS流，其core_size值大于实际数据包长度，越界读取数据包缓冲区之外的内存。

CVSS 7.1 · High EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 0.7.1≤ 8.1.2 affected
6f80e2765492700622596af720534cef33dd31b4 affected
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I. Basic Information for CVE-2026-64833

Vulnerability Information
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Vulnerability Title
FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions 0.7.1 through 8.1.2 contain an out-of-bounds read vulnerability in the S/PDIF muxer that allows attackers to access memory beyond buffer boundaries by supplying a crafted DTS stream with a core_size value larger than the actual packet length. Attackers can exploit the missing bounds check in the spdif_header_dts4 function by providing a malicious DTS-HD audio stream during S/PDIF re-muxing to trigger unauthorized memory reads beyond the packet buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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 0.7.1版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于S/PDIF muxer缺少边界检查，允许攻击者提供特制的DTS流，其core_size值大于实际数据包长度，越界读取数据包缓冲区之外的内存。
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 0.7.1 ~ 8.1.2 -

II. Public POCs for CVE-2026-64833

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III. Intelligence Information for CVE-2026-64833

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Patches & Fixes for CVE-2026-64833 (2)

Vendor Advisories for CVE-2026-64833 (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-2026-64835 8.8 HIGH FFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder
CVE-2026-64834 7.5 HIGH FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-125

V. Comments for CVE-2026-64833

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