# CVE-2026-21358: Adobe InDesign Desktop heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-21358-adobe-indesign-desktop-heap-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-21358 · Severity: medium · CVSS 5.5 · Published 2026-02-10

Adobe InDesign is a professional page layout and design application used by marketers, designers, and publishers to create printed and digital documents. A heap buffer overflow vulnerability in InDesign Desktop versions 21.1, 20.5.1 and earlier can be exploited by convincing a user to open a malicious file, causing the application to crash and disrupting work on critical design projects.

Technologies: [Adobe InDesign Desktop](https://junglewise.ai/threats/technologies/indesign). Vendors: [Adobe](https://junglewise.ai/threats/vendors/adobe).

## Quick answers

**Is CVE-2026-21358 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21358 being exploited in the wild.

**How severe is CVE-2026-21358?** Medium severity, with a CVSS score of 5.5, published 10 February 2026.

**Which products and versions are affected?** Adobe InDesign Desktop 21.1, 20.5.1 and earlier.

**Is there a fix for CVE-2026-21358?** 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-2026-21358 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-21358?** 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

This is a heap-based buffer overflow vulnerability in Adobe InDesign Desktop that occurs when processing maliciously crafted input. The vulnerability is reachable through user interaction—specifically by opening a malicious file—and does not require authentication or network connectivity. Successful exploitation results in denial-of-service by crashing the application; arbitrary code execution is not confirmed. Adobe has released patches to address this vulnerability in versions after 21.1 and 20.5.1.

## Affected products

- Adobe InDesign Desktop 21.1, 20.5.1 and earlier

## Timeline

- 2026-02-10: disclosed

## References

- [https://helpx.adobe.com/security/products/indesign/apsb26-17.html](https://helpx.adobe.com/security/products/indesign/apsb26-17.html)

## Related threats

- [Adobe InDesign Desktop NULL pointer dereference](https://junglewise.ai/threats/cve-2026-84396-indesign-desktop-is-affected-by-a-null-pointer-dereference)
- [Adobe InDesign Desktop null pointer dereference](https://junglewise.ai/threats/cve-2026-76192-indesign-desktop-is-affected-by-a-null-pointer-dereference)
- [Adobe InDesign heap overflow in file processing](https://junglewise.ai/threats/cve-2026-34699-adobe-indesign-heap-overflow-in-file-processing)
- [Adobe InDesign Desktop heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-21357-adobe-indesign-desktop-heap-based-buffer-overflow)
- [Adobe InDesign Desktop heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-21304-adobe-indesign-desktop-heap-based-buffer-overflow)