# CVE-2026-34706: Adobe InCopy out-of-bounds write vulnerability

Source: https://junglewise.ai/threats/cve-2026-34706-adobe-incopy-out-of-bounds-write-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-34706 · Severity: high · CVSS 7.8 · Published 2026-06-09

Adobe InCopy, a professional writing and editing software, is affected by a security flaw that could allow an attacker to take control of a user's computer. To exploit this, an attacker would need to trick a user into opening a specially crafted malicious file. Successful exploitation could lead to unauthorized data access, system disruption, or full compromise of the user's workstation.

Technologies: [Adobe InCopy](https://junglewise.ai/threats/technologies/incopy). Vendors: [Adobe](https://junglewise.ai/threats/vendors/adobe).

## Quick answers

**Is CVE-2026-34706 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34706 being exploited in the wild.

**How severe is CVE-2026-34706?** High severity, with a CVSS score of 7.8, published 9 June 2026.

**Which products and versions are affected?** Adobe InCopy 21.3, 20.5.3 and earlier.

**Is there a fix for CVE-2026-34706?** 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-2026-34706 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-34706?** Check whether you run Adobe InCopy 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

An out-of-bounds write vulnerability (CWE-787) exists in Adobe InCopy versions 21.3, 20.5.3 and earlier. The flaw occurs when the application processes a specially crafted file, leading to memory corruption. An attacker can leverage this to execute arbitrary code with the privileges of the current user. The attack vector is local, requiring the victim to manually open a malicious document (User Interaction required). Adobe has addressed this in security bulletin APSB26-59.

## Affected products

- Adobe InCopy 21.3, 20.5.3 and earlier

## Timeline

- 2026-06-09: advisory: Adobe published security bulletin APSB26-59
- 2026-06-09: disclosed: CVE-2026-34706 published to NVD

## References

- [https://helpx.adobe.com/security/products/incopy/apsb26-59.html](https://helpx.adobe.com/security/products/incopy/apsb26-59.html)

## Related threats

- [Adobe InCopy stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-34708-adobe-incopy-stack-based-buffer-overflow)
- [Adobe InCopy heap overflow in file parsing](https://junglewise.ai/threats/cve-2026-34707-adobe-incopy-heap-overflow-in-file-parsing)
- [Adobe InCopy out-of-bounds write](https://junglewise.ai/threats/cve-2026-34631-adobe-incopy-out-of-bounds-write)
- [Adobe InCopy out-of-bounds read in file parsing](https://junglewise.ai/threats/cve-2026-27287-adobe-incopy-out-of-bounds-read-in-file-parsing)
- [InCopy versions 20.5, 19.5.5 and earlier are affected by a Use After Free vulnerability that could result in arbitrary…](https://junglewise.ai/threats/cve-2025-61818-incopy-versions-20-5-19-5-5-and-earlier-are-affected-by-a-use)