CVE-2026-119719

Description

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.

References

• https://projects.blender.org/blender/blender
• https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97
• https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08
• https://projects.blender.org/blender/blender/pulls/164279
• https://www.vulncheck.com/advisories/blender-before-4.5.15-and-5-x-before-5.2.3-heap-buffer-overflow-via-thumbnail-extraction