Vulnerability Details CVE-2026-66041
FFmpeg 7.0 through 8.1.2, fixed in commit 4da9812, contains a heap out-of-bounds write vulnerability in the vf_quirc filter that allows an attacker to corrupt heap memory by supplying a crafted PGS/SUP subtitle file with mismatched frame dimensions. Attackers can provide a subtitle file whose second presentation has larger dimensions than its first, causing av_image_copy_plane() to copy data exceeding the initial allocation size into the undersized libquirc grayscale image buffer, resulting in heap corruption and process crash with potential for code execution.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 27.2%
CVSS Severity
CVSS v3 Score 8.8
References
Products affected by CVE-2026-66041
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cpe:2.3:a:ffmpeg:ffmpeg:7.0
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cpe:2.3:a:ffmpeg:ffmpeg:7.0.1
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cpe:2.3:a:ffmpeg:ffmpeg:7.0.2
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cpe:2.3:a:ffmpeg:ffmpeg:7.0.3
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cpe:2.3:a:ffmpeg:ffmpeg:7.1
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cpe:2.3:a:ffmpeg:ffmpeg:7.1.1
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cpe:2.3:a:ffmpeg:ffmpeg:7.1.2
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cpe:2.3:a:ffmpeg:ffmpeg:7.1.3
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cpe:2.3:a:ffmpeg:ffmpeg:7.1.4
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cpe:2.3:a:ffmpeg:ffmpeg:7.1.5
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cpe:2.3:a:ffmpeg:ffmpeg:7.2
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cpe:2.3:a:ffmpeg:ffmpeg:8.0
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cpe:2.3:a:ffmpeg:ffmpeg:8.0.1
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cpe:2.3:a:ffmpeg:ffmpeg:8.0.2
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cpe:2.3:a:ffmpeg:ffmpeg:8.0.3
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cpe:2.3:a:ffmpeg:ffmpeg:8.1
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cpe:2.3:a:ffmpeg:ffmpeg:8.1.1