CVE-2026-120243
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
ProductFFmpeg
PublishedNov 1, 2026
First seenNov 4, 2026
Weakness typeCWE-457CWE-457
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| FFmpeg FFmpeg | 2.0 ≤ v ≤ 9.0.2 | — |
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