CVE-2026-125248: FFmpeg 9.0 through 9.0.2 Integer Overflow via FFV1 Vulkan Encoder Remap Buffer

Q: Which workflows are exposed to this issue?

The issue affects FFmpeg 9.0 through 9.0.2 when transcoding large GBRPF32 or GBRAPF32 images or videos to FFV1 using the Vulkan encoder. Workflows that do not use the FFV1 Vulkan encoder are not identified as affected by the provided data.

Q: What must an attacker provide to trigger the vulnerability?

An attacker must be able to supply a sufficiently large GBRPF32 or GBRAPF32 image or video that is processed by a vulnerable FFmpeg instance and transcoded to FFV1 with the Vulkan encoder. The attack vector is local and requires user interaction according to the supplied severity vector.

Q: What is the likely impact of successful exploitation?

The integer overflow can undersize a float remap GPU buffer, leading to out-of-bounds GPU memory writes. Reported outcomes include crashes and memory corruption, with high confidentiality, integrity, and availability impact in the supplied severity vector.

Published Nov 9, 2026

Updated

FFmpeg 9.0 through 9.0.2 contains an integer overflow vulnerability in libavcodec/ffv1encvulkan.c that undersizes the float remap GPU buffer for large frames. Attackers can supply large GBRPF32 or GBRAPF32 images or videos that, when transcoded to FFV1 with the Vulkan encoder, trigger out-of-bounds GPU memory writes causing crashes or memory corruption.

Affected Software

1 affected component

FFmpeg FFmpeg>=9.0<=9.0.2

Event History

Nov 9, 2026

CVE Published

via MITRE·07:11 PM

Data Sourced

via MITRE·07:11 PM

DescriptionSeverityWeakness

Data Sourced

via NVD·07:17 PM

DescriptionSeverityWeakness

Frequently Asked Questions

Which workflows are exposed to this issue?

The issue affects FFmpeg 9.0 through 9.0.2 when transcoding large GBRPF32 or GBRAPF32 images or videos to FFV1 using the Vulkan encoder. Workflows that do not use the FFV1 Vulkan encoder are not identified as affected by the provided data.

What must an attacker provide to trigger the vulnerability?

An attacker must be able to supply a sufficiently large GBRPF32 or GBRAPF32 image or video that is processed by a vulnerable FFmpeg instance and transcoded to FFV1 with the Vulkan encoder. The attack vector is local and requires user interaction according to the supplied severity vector.

What is the likely impact of successful exploitation?

The integer overflow can undersize a float remap GPU buffer, leading to out-of-bounds GPU memory writes. Reported outcomes include crashes and memory corruption, with high confidentiality, integrity, and availability impact in the supplied severity vector.

CVE-2026-125248: FFmpeg 9.0 through 9.0.2 Integer Overflow via FFV1 Vulkan Encoder Remap Buffer

Affected Software

Event History

Frequently Asked Questions

Which workflows are exposed to this issue?

What must an attacker provide to trigger the vulnerability?

What is the likely impact of successful exploitation?

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Frequently Asked Questions

Which workflows are exposed to this issue?

What must an attacker provide to trigger the vulnerability?

What is the likely impact of successful exploitation?