CVE-2026-21304: Adobe Indesign

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

InDesign Desktop versions 21.0, 19.5.5 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Affected products

• Adobe Indesign: before 20.5.1 (fixed in 20.5.1); from 21.0, before 21.1 (fixed in 21.1)

Published 2026-01-13. Last modified 2026-08-28.