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VULNERABILITIES

CVE-2026-120243 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24858 [email protected]
https://github.com/FFmpeg/FFmpeg [email protected]
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/g2meet.c#L1040-L1042 [email protected]
https://github.com/FFmpeg/FFmpeg/commit/edad2d0dafcf44fa315eab716fd0183ce808053b [email protected]
https://www.vulncheck.com/advisories/ffmpeg-2.0-through-9.0.2-information-disclosure-via-g2m-kempf-palette [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-457Use of Uninitialized Variable[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-120243
NVD Published Date:
Nov 1, 2026
NVD Last Modified:
Nov 6, 2026
Source:
[email protected]
CVE-2026-120243 Details - Not Deferred