Bug 2571110 (CVE-2026-125202)

Summary: CVE-2026-125202 ffmpeg: FFmpeg: Arbitrary code execution via heap buffer overflow in VAAPI HEVC 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. An attacker could achieve arbitrary code execution or cause a denial of service (DoS) by providing a specially crafted High Efficiency Video Coding (HEVC) video stream. Due to a heap-based buffer overflow in the Video Acceleration API (VAAPI) decoder, unbounded tile information is copied beyond allocated memory boundaries. Applications utilizing VAAPI to decode malicious media streams are subject to heap memory corruption.
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Description OSIDB Bzimport 2026-11-10 20:41:02 UTC
FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in vaapi_hevc_start_frame() in libavcodec/vaapi_hevc.c that copies unbounded PPS tile counts into fixed-size arrays. Attackers can supply a crafted HEVC bitstream with a large picture and many tiles to write controlled 16-bit values past heap-allocated hwaccel data, corrupting memory in applications decoding with VAAPI.