Bug 2569549 (CVE-2026-125199)

Summary: CVE-2026-125199 ffmpeg: ffmpeg: Denial of Service via memory leak in VC-1 decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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. By tricking a user or application into decoding a specially crafted media file containing oversized video slices, an attacker can cause the decoder to fail to release allocated memory. This memory leak can exhaust available system resources, resulting in an application crash and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-11-10 13:02:28 UTC
FFmpeg through 9.0.2 contains a memory leak vulnerability in vc1_decode_frame() in libavcodec/vc1dec.c that leaks slice buffers when init_get_bits8() fails. Attackers can supply crafted files with repeated oversized VC-1 slices exceeding the bit reader limit to exhaust memory of decoding applications.