# CVE-2026-34707: Adobe InCopy heap overflow in file parsing

Source: https://junglewise.ai/threats/cve-2026-34707-adobe-incopy-heap-overflow-in-file-parsing  
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-2026-34707 · Severity: high · CVSS 7.8 · Published 2026-06-09

Adobe InCopy, a professional writing and editing software, is vulnerable to a security flaw when processing specially crafted files. If a user is tricked into opening a malicious file, an attacker could take control of the computer and run unauthorized commands. This could lead to the theft of sensitive data or a complete system compromise.

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

## Quick answers

**Is CVE-2026-34707 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-34707 being exploited in the wild.

**How severe is CVE-2026-34707?** 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-2026-34707?** 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-2026-34707 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-34707?** 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

A heap-based buffer overflow (CWE-122) exists in Adobe InCopy versions 21.3, 20.5.3 and earlier. The vulnerability is triggered when the application fails to properly validate input while parsing a malicious file, leading to memory corruption. An attacker can exploit this by convincing a victim to open a specifically crafted document. Successful exploitation allows for arbitrary code execution in the context of the current user. The attack vector is local (AV:L) and requires user interaction (UI:R).

## Affected products

- Adobe InCopy 21.3, 20.5.3 and earlier

## Timeline

- 2026-06-09: disclosed
- 2026-06-09: advisory

## 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 out-of-bounds write vulnerability](https://junglewise.ai/threats/cve-2026-34706-adobe-incopy-out-of-bounds-write-vulnerability)
- [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)