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CVE-2026-120243— FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette

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 2.0 至 9.0.2 版本中的 Go2Meeting 解码器存在未初始化变量使用漏洞。攻击者可利用越界的调色板索引，通过该漏洞泄露栈内存。攻击者可构造包含短 Kempf 调色板的 G2M3/G2M4 流，致使 函数将未初始化的栈字节（包括指针或栈保护值）复制到解码输出中。

CVSS 5.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 2.0≤ 9.0.2 affected
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I. Basic Information for CVE-2026-120243

Vulnerability Information
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Vulnerability Title
FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg 2.0 through 9.0.2 contains a use of uninitialized variable vulnerability in the Go2Meeting decoder that allows attackers to leak stack memory through out-of-range palette indices. Attackers can craft a G2M3/G2M4 stream with a short Kempf palette so kempf_restore_buf() copies uninitialized stack bytes, including pointers or stack guards, into decoded output.
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
使用未经初始化的变量
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 2.0 ~ 9.0.2 -

II. Public POCs for CVE-2026-120243

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III. Intelligence Information for CVE-2026-120243

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Other References for CVE-2026-120243 (4)

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

CVE-2026-120247 5.5 MEDIUM FFmpeg 2.3 through 9.0.2 Huffyuv Decoder Uninitialized Heap Memory Disclosure
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-2026-120245 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-457