Blender before 4.5.15 and 5.x before 5.2.3 Heap Buffer Overflow via Thumbnail Extraction
CVE-2026-119719 is fixed in blender on 1 platform by blender 5.2.3 (version 5.2.3), released October 22, 2026. 2 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| blender | 5.2.3 | blender 5.2.3 | Oct 22, 2026 |
| No fix yet | |||
| blender (Windows apps) | No fix yet | no-fix | n/a |
| blender (Windows apps) | No fix yet | no-fix | n/a |
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