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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Blender Foundation | Blender | < 4.5.15, 5.0.0 – < 5.2.3 | 4.5.15 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | blender | No fix yet | — |
| Debian 13 | blender | No fix yet | — |
| Debian 12 | blender | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | blender | No fix yet | — |
| Ubuntu 26.04 LTS | blender | No fix yet | — |
| Ubuntu 24.04 LTS | blender | No fix yet | — |
| Ubuntu 22.04 LTS | blender | No fix yet | — |
| Ubuntu 20.04 LTS | blender | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | blender | No fix yet | — |
| Ubuntu 16.04 LTS | blender | No fix yet | — |
References
- 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
- VulnCheck Advisory: Blender before 4.5.15 and 5.x before 5.2.3 Heap Buffer Overflow via Thumbnail Extraction third-party-advisory