Bug 2506591 (CVE-2026-65705)

Summary: CVE-2026-65705 FFmpeg: FFmpeg: Arbitrary code execution via out-of-bounds write in vf_floodfill video filter
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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. This vulnerability, an out-of-bounds write, affects the vf_floodfill video filter. An attacker could exploit this by providing a malicious video stream, which, when processed with filtergraph reinitialization disabled, causes heap memory corruption. This can lead to a denial of service due to a process crash, and in some cases, may enable arbitrary code execution.
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Description OSIDB Bzimport 2026-07-23 20:02:26 UTC 
FFmpeg versions 3.4 through 8.1.2 contain an out-of-bounds write vulnerability in the vf_floodfill video filter that allows attackers to corrupt heap memory by supplying a dynamically sized video stream with filtergraph reinitialization disabled via -reinit_filter 0. When config_input() allocates the points traversal stack based on initial frame dimensions and a subsequent larger frame is processed, filter_frame() performs flood-fill neighbor pushes beyond the original allocation boundary, resulting in heap corruption and process crash with potential for code execution depending on heap layout and process hardening.