CVE-2026-96396 Integer overflow in affinity
A crafted document causes an integer overflow leading to heap corruption and application crash when previewed in Finder.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-96396?
CVE-2026-96396 is a medium-severity vulnerability in canva affinity, published on 9 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-122
Which versions are affected by CVE-2026-96396?
How do I fix CVE-2026-96396?
No fix has been published for CVE-2026-96396 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-96396 being exploited?
There is no known exploitation of CVE-2026-96396 in the wild and no public exploit code.
Sources
Also known as GHSA-cxqf-wmjh-f84m.