Adobe InDesign Desktop up to 20.5.1/21.1 File heap-based overflow

Summaryinfo

A vulnerability was found in Adobe InDesign Desktop up to 20.5.1/21.1. It has been rated as critical. This vulnerability affects unknown code of the component File Handler. The manipulation leads to heap-based overflow. This vulnerability is traded as CVE-2026-21358. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Adobe InDesign Desktop up to 20.5.1/21.1. This issue affects an unknown function of the component File Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to 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(). Impacted is availability. The summary by CVE is:

InDesign Desktop versions 21.1, 20.5.1 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result in application denial-of-service. An attacker could exploit this vulnerability to crash the application, causing disruption to services. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

It is possible to read the advisory at helpx.adobe.com. The identification of this vulnerability is CVE-2026-21358 since 12/12/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/10/2026).

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
• 21.0
• 21.1

License

• commercial

Website

• Vendor: https://www.adobe.com/

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