Bug 2569586 (CVE-2026-125243)

Summary: CVE-2026-125243 ffmpeg: FFmpeg: Information disclosure via crafted JPEG-LS image
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 system to process a specially crafted JPEG-LS image file. When decoding specific line-interleaved image scans, the decoder fails to properly initialize memory, resulting in information disclosure where residual heap memory data is exposed in decoded frames.
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Description OSIDB Bzimport 2026-11-10 13:07:59 UTC
FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in ff_jpegls_decode_picture() in libavcodec/jpeglsdec.c, which decodes 16-bit line-interleaved JPEG-LS scans as 8-bit samples. Attackers can supply a crafted single-component JPEG-LS image with the ILV byte set to 1, causing decoded GRAY16 frames to expose leftover heap memory.