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.
Published: 2026-11-01
Score: 6.8 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sun, 01 Nov 2026 01:00:00 +0000

Type Values Removed Values Added
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.
Title FFmpeg 2.0 through 9.0.2 Information Disclosure via G2M Kempf Palette
First Time appeared Ffmpeg
Ffmpeg ffmpeg
Weaknesses CWE-457
CPEs cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*
Vendors & Products Ffmpeg
Ffmpeg ffmpeg
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-01T00:57:09.338Z

Reserved: 2026-10-31T22:05:52.181Z

Link: CVE-2026-120243

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-01T01:17:17.593

Modified: 2026-11-01T01:17:17.593

Link: CVE-2026-120243

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-01T02:30:18Z

Weaknesses