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CVE-2026-120247— FFmpeg 2.3 through 9.0.2 Huffyuv Decoder Uninitialized Heap Memory Disclosure

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 2.3 至 9.0.2 版本的 Huffyuv 解码器中存在未初始化资源使用漏洞。攻击者可通过构造简短的打包 BGR 比特流，将堆内存泄露到解码后的像素数据中。具体而言，攻击者可制作 Huffyuv BGR24 或 BGRA 视频文件，使其熵数据提前结束，导致 函数将未初始化的 字节写入输出帧，从而暴露堆内存内容。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1069 · Permission Groups Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 2.3≤ 9.0.2 affected
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I. Basic Information for CVE-2026-120247

Vulnerability Information
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Vulnerability Title
FFmpeg 2.3 through 9.0.2 Huffyuv Decoder Uninitialized Heap Memory Disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg 2.3 through 9.0.2 contains a use of uninitialized resource vulnerability in the Huffyuv decoder that allows attackers to leak heap memory into decoded pixels via short packed-BGR bitstreams. Attackers can craft a Huffyuv BGR24/BGRA video whose entropy data ends early, causing decode_slice() to add uninitialized s->temp[0] bytes into output frames, exposing heap contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 2.3 ~ 9.0.2 -

II. Public POCs for CVE-2026-120247

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III. Intelligence Information for CVE-2026-120247

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Other References for CVE-2026-120247 (4)

Same Patch Batch · FFmpeg · 2026-11-01 · 5 CVEs total

CVE-2026-120244 5.5 MEDIUM FFmpeg 2.1 through 9.0.2 Uninitialized Memory Leak via PCX Decoder
CVE-2026-120246 5.5 MEDIUM FFmpeg 4.4 through 9.0.2 Uninitialized Memory Disclosure via CDXL HAM Decoder
CVE-2026-120243 5.5 MEDIUM FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette
CVE-2026-120245 5.5 MEDIUM FFmpeg 0.10 through 9.0.2 Uninitialized Memory Disclosure via Sun Raster Decoder

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-908