Live › vulnerability › CVE-2026-119719
Blender's thumbnail extractor mishandles 32-bit integer math when flipping thumbnail image data, so a crafted .blend file with malicious TEST block dimensions causes an out-of-bounds heap write. An attacker can crash the thumbnailer or run code when a victim previews the file in Windows Explorer or with blender-thumbnailer.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-30 16:31 UTC. All times on this page are UTC.
Anyone running Blender below 4.5.15 (LTS) or below 5.2.3 (LTS) who previews .blend files through Windows Explorer's thumbnail handler or blender-thumbnailer. This includes artists and studios and pipelines or asset sites that generate thumbnails from uploaded .blend files. Machines that never preview or handle untrusted .blend files can skip it.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Blender | vendor | < 4.5.15, 5.x < 5.2.3 | 4.5.15, 5.2.3 |
4.5.15 / 5.2.34.5.15 LTS or 5.2.3 LTS (or later)Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Blender before 4.5.15 and 5.x before 5.2.3 contains a heap buffer overflow vulnerability in the blend file thumbnail extractor caused by 32-bit integer overflow in thumb_data_vertical_flip(). Attackers can craft a .blend file with malicious TEST block dimensions that trigger an out-of-bounds write when blender-thumbnailer or the Windows shell extension previews it, causing crashes or code execution.
This page as .md · .json · in your agent: get_signal("CVE-2026-119719")
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