Quick answers
- Is CVE-2026-21277 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21277 being exploited in the wild.
- How severe is CVE-2026-21277?
- High severity, with a CVSS score of 7.8, published 13 January 2026.
- Which products and versions are affected?
- Adobe InDesign 19.5.5, 21.0 and earlier.
- Is there a fix for CVE-2026-21277?
- 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-2026-21277 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-21277?
- Check whether you run Adobe InDesign 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
A heap-based buffer overflow vulnerability exists in Adobe InDesign that permits arbitrary code execution within the context of the user running the application. The vulnerability is triggered when a user opens a crafted malicious file, indicating the flaw likely resides in file parsing or processing logic. The attack requires user interaction (opening a file) but no authentication bypass or elevated privileges are necessary. An attacker can achieve arbitrary code execution on the victim's system with the privileges of the logged-in user. Adobe has addressed this issue in patched versions beyond 19.5.5 and 21.0.
Affected products
- Adobe InDesign 19.5.5, 21.0 and earlier
Timeline
- 2026-01-13: disclosed