FFmpeg up to 8.1.2 vf_quirc filter av_image_copy_plane out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k3.91

Summaryinfo

A vulnerability categorized as critical has been discovered in FFmpeg up to 8.1.2. Affected by this vulnerability is the function av_image_copy_plane of the component vf_quirc filter. Executing a manipulation can lead to out-of-bounds write. This vulnerability is registered as CVE-2026-66041. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in FFmpeg up to 8.1.2. It has been declared as critical. This vulnerability affects the function av_image_copy_plane of the component vf_quirc filter. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at code.ffmpeg.org. This vulnerability was named CVE-2026-66041 since 07/23/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available.

Applying the patch 4da9812e25894fb51d62a8875cfa8eb39b5e20f5 is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 4da9812e25894fb51d62a8875cfa8eb39b5e20f5

Timelineinfo

07/23/2026 CVE reserved
07/24/2026 +1 days Advisory disclosed
07/24/2026 +0 days VulDB entry created
07/24/2026 +0 days VulDB entry last update

Sourcesinfo

Product: ffmpeg.org

Advisory: code.ffmpeg.org
Status: Confirmed

CVE: CVE-2026-66041 (🔒)
GCVE (CVE): GCVE-0-2026-66041
GCVE (VulDB): GCVE-100-383020

Entryinfo

Created: 07/24/2026 22:26
Changes: 07/24/2026 22:26 (55)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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