Bug 2570518 (CVE-2026-125095)

Summary: CVE-2026-125095 ffmpeg: ffmpeg: Information disclosure via uninitialized stack memory in C93 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 by enticing a user or automated processing pipeline to decode a specially crafted, truncated Interplay C93 video file. Because the C93 video decoder fails to verify the amount of color table data copied during frame decoding, uninitialized stack memory bytes can be written into decoded frames, leading to information disclosure of sensitive memory contents.
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Description OSIDB Bzimport 2026-11-10 20:04:17 UTC 
FFmpeg through 9.0.2 contains an uninitialized memory use vulnerability in the C93 video decoder in libavcodec/c93.c, where decode_frame() never checks how many color table bytes were copied. Attackers can supply a crafted truncated Interplay C93 file so draw_n_color() writes uninitialized stack bytes into decoded frames, disclosing stack memory contents.