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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://projects.blender.org/blender/blender/pulls/164279 patch
- https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08 patch
- https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97 patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.5 · blender foundationNVD modified 2026-10-30 15:16
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 5
- https://projects.blender.org/blender/blender/pulls/164279 patch
- https://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08 patch
- https://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97 patch
- https://projects.blender.org/blender/blender product
- https://www.vulncheck.com/advisories/blender-before-4.5.15-and-5-x-before-5.2.3-heap-buffer-overflow-via-thumbnail-extraction third-party-advisory