CVE-2026-96396
Affinity Heap-Based Buffer Overflow Vulnerability
Description
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.
INFO
Published Date :
Oct. 9, 2026, 1:17 p.m.
Last Modified :
Oct. 9, 2026, 1:17 p.m.
Remotely Exploit :
No
Source :
61adb53e-e4b3-47f7-8a93-4717c9e77dc6
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 61adb53e-e4b3-47f7-8a93-4717c9e77dc6 | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Affinity by Canva to version 3.3.1 or later.
- Ensure QuickLook thumbnail generation is secure.
- Avoid previewing untrusted Affinity documents.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-96396.
| URL | Resource |
|---|---|
| https://trust.canva.com?tcuUid=1998378a-9134-47e9-b761-7a49d5fd6bfb |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-96396 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-96396
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-96396 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-96396 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 61adb53e-e4b3-47f7-8a93-4717c9e77dc6
Oct. 09, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L Added CWE CWE-122 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/96xxx/CVE-2026-96396.json">CVE-2026-96396</a> Added Reference https://trust.canva.com?tcuUid=1998378a-9134-47e9-b761-7a49d5fd6bfb