Adobe InDesign Desktop up to 19.5.5/21.0 File heap-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in Adobe InDesign Desktop up to 19.5.5/21.0. This impacts an unknown function of the component File Handler. The manipulation results in heap-based overflow. This vulnerability is identified as CVE-2026-21304. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Adobe InDesign Desktop up to 19.5.5/21.0. Affected is an unknown functionality of the component File Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as 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(). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

InDesign Desktop versions 21.0, 19.5.5 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 is traded as CVE-2026-21304 since 12/12/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. 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 08/28/2026).

The vulnerability scanner Nessus provides a plugin with the ID 283679 (Adobe InDesign < 20.5.1 / 21.0 < 21.1.0 Multiple Vulnerabilities (APSB26-02) (macOS)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (283679). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Image Processing Software

Vendor

• Adobe

Name

• InDesign Desktop

Version

• 19.5.0
• 19.5.1
• 19.5.2
• 19.5.3
• 19.5.4
• 19.5.5
• 21.0

License

• commercial

Website

• Vendor: https://www.adobe.com/

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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