CVE-2026-34708 is a stack-based buffer overflow vulnerability (CWE-121) affecting Adobe InCopy versions 21.3, 20.5.3, and earlier. This flaw allows an attacker to execute arbitrary code in the context of the current user if the victim opens a specially crafted malicious file. The vulnerability requires user interaction and has a CVSS 3.1 base score of 7.8, indicating high severity. No known exploits are reported in the wild, and no patch or remediation information is provided in the available data.

Successful exploitation can lead to arbitrary code execution with the privileges of the current user, potentially compromising confidentiality, integrity, and availability of the affected system. The attack vector requires local user interaction by opening a malicious file, limiting remote exploitation without user involvement.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should avoid opening files from untrusted sources and apply standard security best practices to limit exposure.