---
id: CVE-2026-96396
title: >-
  The Affinity by Canva application for macOS before 3.3.1 (October 2026
  release) did not safely calculate the size of an image buffer when generating
  QuickLook thumbnails and previews of Affinity document files, leading to an
  integer over…
summary: >-
  The Affinity by Canva application for macOS before 3.3.1 (October 2026
  release) did not safely calculate the size of an image buffer when generating
  QuickLook thumbnails and previews of Affinity document files, leading to an
  integer over…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-122
published: '2026-10-09'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T17:16:51.420'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96396'
references:
  - url: 'https://trust.canva.com?tcuUid=1998378a-9134-47e9-b761-7a49d5fd6bfb'
    label: 61adb53e-e4b3-47f7-8a93-4717c9e77dc6
tags:
  - nvd
ingestedAt: '2026-10-09T13:58:52.549Z'
---

## Overview

The Affinity by Canva application for macOS before 3.3.1 (October 2026 release) did not safely calculate the size of an image buffer when generating QuickLook thumbnails and previews of Affinity document files, leading to an integer overflow and a heap-based buffer overflow. A threat actor could craft an Affinity document that, when displayed or previewed by a user in Finder, could corrupt heap memory and cause the thumbnail or preview extension to crash.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.