CVE-2026-34707

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in InCopy

Publication date: 2026-06-09

Last updated on: 2026-06-10

Assigner: Adobe Systems Incorporated

Description

InCopy versions 21.3, 20.5.3 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-09

Last Modified

2026-06-10

Generated

2026-06-30

AI Q&A

2026-06-10

EPSS Evaluated

2026-06-28

NVD

CVE-2026-34707

EUVD

EUVD-2026-35787

Affected Vendors & Products

Vendor	Product	Version / Range
adobe	incopy	to 20.5.4 (exc)
adobe	incopy	From 21.0 (inc) to 21.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Mitigation Strategies

To mitigate this vulnerability, avoid opening malicious files in affected versions of Adobe InCopy (versions 21.3, 20.5.3 and earlier). Since exploitation requires user interaction, educating users to not open suspicious or untrusted files can reduce risk.

Additionally, updating Adobe InCopy to a version later than 21.3 or 20.5.3, once a patch is available, is recommended to fully address the vulnerability.

Executive Summary

This vulnerability is a heap-based buffer overflow found in Adobe InCopy versions 21.3, 20.5.3, and earlier. It occurs when a user opens a specially crafted malicious file, which can cause the program to overwrite memory in an unsafe way.

If exploited, this flaw could allow an attacker to execute arbitrary code with the privileges of the current user.

Impact Analysis

If exploited, this vulnerability could allow an attacker to run arbitrary code on your system with the same permissions as the user who opened the malicious file.

This could lead to unauthorized actions such as installing malware, stealing data, or taking control of the affected system.

However, exploitation requires user interaction, specifically opening a malicious file.

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