CVE-2026-125190

FFmpeg through 9.0.2 Uninitialized Stack Memory Disclosure via MVC2 Decoder

Published Nov 9, 2026 CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
Description
FFmpeg through 9.0.2 contains an information disclosure vulnerability in decode_mvc2() in libavcodec/mvcdec.c that leaks uninitialized stack memory through unchecked palette indices. Attackers can supply a crafted MVC2 stream declaring few colors but referencing higher palette indices, copying process stack contents into decoded RGB frames.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Description FFmpeg through 9.0.2 contains an information disclosure vulnerability in decode_mvc2() in libavcodec/mvcdec.c that leaks uninitialized stack memory through unchecked palette indices. Attackers can supply a crafted MVC2 stream declaring few colors but referencing higher palette indices, copying process stack contents into decoded RGB frames.
Title FFmpeg through 9.0.2 Uninitialized Stack Memory Disclosure via MVC2 Decoder
First Time appeared Ffmpeg
Ffmpeg ffmpeg
Weaknesses CWE-908
CPEs cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*
Vendors & Products Ffmpeg
Ffmpeg ffmpeg
References
Metrics cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 13, 2026, 12:49 PM
Reserved
Nov 9, 2026, 6:15 PM
Status
Undergoing Analysis
Published
Nov 9, 2026, 7:16 PM
Modified
Nov 13, 2026, 1:18 PM