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CVE-2026-65704— FFmpeg 8.1.2 Out-of-Bounds Write via TY Demuxer and Shorten 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 8.1.2及之前版本存在安全漏洞，该漏洞源于TY demuxer的demux_audio()函数在减少数据包大小时未进行边界检查，产生负大小值，传递给shorten_decode_frame()中的memcpy()后转换为接近SIZE_MAX，导致越界读取和写入，攻击者可通过提供特制的ffconcat文件并处理-safe 0标志造成堆损坏。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 8.1.2 affected
de771bd52774a52d45b0e2c82e56995a1ef40df7 unaffected
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I. Basic Information for CVE-2026-65704

Vulnerability Information
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Vulnerability Title
FFmpeg 8.1.2 Out-of-Bounds Write via TY Demuxer and Shorten Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 8.1.2 contains an out-of-bounds write vulnerability that allows attackers to cause heap corruption by supplying a crafted ffconcat file processed with the -safe 0 flag. The TY demuxer's demux_audio() function decrements packet size without bounds checking, producing a negative size value that is passed to memcpy() in shorten_decode_frame(), where conversion to size_t wraps the value to near SIZE_MAX and triggers reads beyond the source allocation and writes far beyond the Shorten decoder's bitstream buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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 数字错误漏洞
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 8.1.2及之前版本存在安全漏洞，该漏洞源于TY demuxer的demux_audio()函数在减少数据包大小时未进行边界检查，产生负大小值，传递给shorten_decode_frame()中的memcpy()后转换为接近SIZE_MAX，导致越界读取和写入，攻击者可通过提供特制的ffconcat文件并处理-safe 0标志造成堆损坏。
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 ~ 8.1.2 -

II. Public POCs for CVE-2026-65704

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III. Intelligence Information for CVE-2026-65704

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Patches & Fixes for CVE-2026-65704 (2)

Vendor Advisories for CVE-2026-65704 (1)

Same Patch Batch · FFmpeg · 2026-07-23 · 4 CVEs total

CVE-2026-65703 7.8 HIGH FFmpeg 2.7 - 8.1.2 Out-of-Bounds Write in TDSC Video Decoder
CVE-2026-65706 7.8 HIGH FFmpeg 3.0 - 8.1.2 vf_swaprect Out-of-Bounds Write via NV12 Frame Processing
CVE-2026-65705 7.8 HIGH FFmpeg 3.4 - 8.1.2 vf_floodfill Out-of-Bounds Write via filter_frame()

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-65704

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