# CVE-2026-66041: ffmpeg: FFmpeg 7.0 through 8.1.2, fixed in commit 4da9812, contains a heap out-of-bounds write vulnerability in the vf_quirc...

CVE-2026-66041 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-66041, released July 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-66041
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 24, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | ffmpeg Debian 14 | 7:9.0.2-1 | [DEBIAN-CVE-2026-66041](https://patchblox.com/security/data/fix/linux/debian-cve-2026-66041.md) | Jul 24, 2026 |
| Linux | ffmpeg-7 opensuse-leap 16.0 | 7.1.4-160000.3.1 | [OPENSUSE-SU-2026:21572-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21572-1.md) | Aug 12, 2026 |
| Linux | ffmpeg-7 sles 16.0 | 7.1.4-160000.3.1 | [SUSE-SU-2026:23232-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23232-1.md) | Aug 12, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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