Bug 2569546 (CVE-2026-125190)

Summary: CVE-2026-125190 ffmpeg: ffmpeg: Information disclosure via uninitialized stack memory in MVC2 decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in FFmpeg. An attacker could exploit this vulnerability to cause information disclosure by convincing a user or service to process a specially crafted MVC2 video file. Due to insufficient validation of palette indices in the decoder, uninitialized stack memory can be copied into decoded video frames, potentially exposing sensitive data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-10 13:02:11 UTC
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.