What is CVE-2026-96396?

CVE-2026-96396 is a medium-severity vulnerability in Canva Affinity, classified under Heap-based Buffer Overflow. CVSS score: 4.9/10. Published 2026-10-09.

How severe is CVE-2026-96396?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Buffer overflow in Canva Affinity

CVE-2026-96396

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.

Vulnerability class: Buffer Overflow

Published 2026-10-09 · last modified 2026-10-09.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Canva Affinity

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

61adb53e-e4b3-47f7-8a93-4717c9e77dc6

Frequently asked questions

What is CVE-2026-96396?: CVE-2026-96396 is a medium-severity vulnerability in Canva Affinity, classified under Heap-based Buffer Overflow. CVSS score: 4.9/10. Published 2026-10-09.
How severe is CVE-2026-96396?: Medium severity. CVSS v3 base score is 4.9 out of 10.