Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-07-23T19:00:36 FFmpeg: FFmpeg: Arbitrary code execution via out-of-bounds write in vf_floodfill video filter 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CWE-787

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.

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.

Red Hat Enterprise Linux has multiple layers of heap protection. NX/DEP (Non-Executable Memory) prevents code execution from heap, thus mitigating the code execution part of the exploit. Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred ffmpeg Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-aws-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-azure-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-azure-rocm-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-gcp-cuda-rhel9 Red Hat Enterprise Linux AI (RHEL AI) 3 Fix deferred rhelai3/bootc-rocm-rhel9 Red Hat OpenShift AI (RHOAI) Fix deferred rhoai/odh-vllm-gaudi-rhel9 https://www.cve.org/CVERecord?id=CVE-2026-65705 https://nvd.nist.gov/vuln/detail/CVE-2026-65705 https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/f186c50cf53aec20e9a29059cb22ca3f2d59201c https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23780 https://www.vulncheck.com/advisories/ffmpeg-vf-floodfill-out-of-bounds-write-via-filter-frame