Blender up to 4.5.14/5.2.2 Thumbnail thumb_data_vertical_flip integer overflow

Summaryinfo

A vulnerability classified as critical was found in Blender up to 4.5.14/5.2.2. This affects the function thumb_data_vertical_flip of the component Thumbnail. Executing a manipulation can lead to integer overflow. The identification of this vulnerability is CVE-2026-119719. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Blender up to 4.5.14/5.2.2. This vulnerability affects the function thumb_data_vertical_flip of the component Thumbnail. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at projects.blender.org. This vulnerability was named CVE-2026-119719 since 10/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 4.5.15 or 5.2.3 eliminates this vulnerability.

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Productinfo

Name

• Blender

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3
• 4.5.4
• 4.5.5
• 4.5.6
• 4.5.7
• 4.5.8
• 4.5.9
• 4.5.10
• 4.5.11
• 4.5.12
• 4.5.13
• 4.5.14
• 5.2.0
• 5.2.1
• 5.2.2

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