Adobe InCopy up to 20.5.3/21.3 File heap-based overflow

Summaryinfo

A vulnerability was found in Adobe InCopy up to 20.5.3/21.3 and classified as critical. Impacted is an unknown function of the component File Handler. Executing a manipulation can lead to heap-based overflow. The identification of this vulnerability is CVE-2026-34707. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Adobe InCopy up to 20.5.3/21.3 and classified as critical. This vulnerability affects an unknown code of the component File Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is 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(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at helpx.adobe.com. This vulnerability was named CVE-2026-34707 since 03/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/09/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Vendor

• Adobe

Name

• InCopy

Version

• 20.5.0
• 20.5.1
• 20.5.2
• 20.5.3
• 21.0
• 21.1
• 21.2
• 21.3

License

• commercial

Website

• Vendor: https://www.adobe.com/

CPE 2.3info

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Entryinfo

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