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CVE-2026-66041 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CNA: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/4da9812e25894fb51d62a8875cfa8eb39b5e20f5	[email protected]	Patch
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23625	[email protected]	ExploitPatch
https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-via-vf-quirc-filter	[email protected]	Third Party Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-787	Out-of-bounds Write	[email protected]

Affected Products

Product	Versions
ffmpeg ffmpeg	>= 7.0, <= 8.1.2
CPE cpe:2.3:a:ffmpeg:ffmpeg:::::::: Remediation No remediation found in references.

Change History

4 change records found show changes

Date	Action	Recorded By
Aug 7, 2026	Initial Analysis	[email protected]
Jul 29, 2026	CVE Modified	CISA-ADP
Jul 25, 2026	CVE Modified	CISA-ADP
Jul 24, 2026	New CVE Received	[email protected]