Adobe InDesign Desktop up to 20.5.3/21.3 File heap-based overflow

Summaryinfo

A vulnerability described as critical has been identified in Adobe InDesign Desktop up to 20.5.3/21.3. Affected is an unknown function of the component File Handler. Executing a manipulation can lead to heap-based overflow. This vulnerability appears as CVE-2026-34699. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Adobe InDesign Desktop up to 20.5.3/21.3. It has been declared as critical. This vulnerability affects an unknown code block 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:

InDesign Desktop 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 shared for download at helpx.adobe.com. This vulnerability was named CVE-2026-34699 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. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/09/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Image Processing Software

Vendor

• Adobe

Name

• InDesign Desktop

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/

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