Quick answers
- Is CVE-2026-21304 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21304 being exploited in the wild.
- How severe is CVE-2026-21304?
- High severity, with a CVSS score of 7.8, published 13 January 2026.
- Which products and versions are affected?
- Adobe InDesign Desktop 21.0, 19.5.5 and earlier.
- Is there a fix for CVE-2026-21304?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-21304 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-21304?
- Check whether you run Adobe InDesign Desktop at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
InDesign Desktop versions 21.0, 19.5.5 and earlier contain a heap-based buffer overflow vulnerability in file parsing logic. The vulnerability is triggered when a user opens a specially crafted malicious file, causing a heap buffer to be overflowed. Exploitation requires user interaction (opening a malicious file) but no authentication. A successful exploit allows an attacker to execute arbitrary code in the context of the current user with the privileges of that user account.
Affected products
- Adobe InDesign Desktop 21.0, 19.5.5 and earlier
Timeline
- 2026-01-13: disclosed