CVE-2026-27285: Adobe InDesign Buffer Overflow Vulnerability

CVE-2026-27285 Overview

CVE-2026-27285 is a Heap-based Buffer Overflow vulnerability affecting Adobe InDesign Desktop that could lead to application denial-of-service. An attacker could exploit this vulnerability to crash the application or disrupt its functionality by tricking a user into opening a specially crafted malicious file.

Critical Impact

Successful exploitation allows attackers to crash Adobe InDesign or disrupt its functionality, potentially causing loss of work and productivity disruption for creative professionals using the application.

Affected Products

• Adobe InDesign Desktop version 20.5.2 and earlier
• Adobe InDesign Desktop version 21.2 and earlier
• Affects both Microsoft Windows and Apple macOS platforms

Discovery Timeline

• 2026-04-14 - CVE-2026-27285 published to NVD
• 2026-04-16 - Last updated in NVD database

Technical Details for CVE-2026-27285

Vulnerability Analysis

This vulnerability is classified as CWE-122: Heap-based Buffer Overflow. When Adobe InDesign processes a maliciously crafted file, the application fails to properly validate input boundaries before writing data to heap-allocated memory. This allows an attacker to cause memory corruption by overflowing a heap buffer, leading to an application crash.

The vulnerability requires user interaction for exploitation - specifically, the victim must open a malicious file. This local attack vector requires an attacker to either socially engineer the victim into opening the crafted file or have the ability to place the malicious file on a system where the victim will access it.

Root Cause

The root cause lies in improper bounds checking when handling specific file structures within Adobe InDesign. When parsing certain data elements, the application allocates a heap buffer that may be insufficient for the actual data being processed. The subsequent write operation overflows the buffer boundary, corrupting adjacent heap memory and destabilizing the application.

Attack Vector

The attack requires local access and user interaction. An attacker would need to:

1. Craft a malicious InDesign file (.indd, .indt, .idml, or related format) containing data designed to trigger the overflow
2. Deliver the file to the victim through email, file sharing, or other means
3. Convince the victim to open the malicious file in Adobe InDesign

Upon opening the file, the heap buffer overflow occurs during file parsing, causing the application to crash. While the impact is limited to denial-of-service in this case, heap-based buffer overflows can sometimes be leveraged for more severe attacks depending on the specific memory layout and protections in place.

The vulnerability is triggered when the application attempts to process specially crafted data elements within the file structure. The overflow occurs because the allocated heap buffer size is calculated incorrectly or the incoming data exceeds expected boundaries without proper validation. For technical details, refer to the Adobe InDesign Security Advisory.

Detection Methods for CVE-2026-27285

Indicators of Compromise

• Unexpected Adobe InDesign application crashes when opening files from untrusted sources
• Crash logs showing heap corruption or memory access violations in the InDesign process
• Suspicious InDesign document files received via email or downloaded from untrusted websites
• Windows Event Log or macOS Console entries indicating InDesign.exe or Adobe InDesign memory-related faults

Detection Strategies

• Monitor application crash events for Adobe InDesign with memory corruption indicators
• Implement endpoint detection rules to identify suspicious file access patterns before InDesign launches
• Deploy email gateway scanning to detect potentially malicious InDesign file attachments
• Use file integrity monitoring to detect unauthorized InDesign documents appearing in user directories

Monitoring Recommendations

• Configure endpoint protection to alert on repeated InDesign crashes within short time periods
• Enable enhanced logging for desktop publishing applications to capture file open events
• Monitor network traffic for InDesign files being downloaded from suspicious domains
• Set up alerts for users reporting unexpected crashes after opening shared documents

How to Mitigate CVE-2026-27285

Immediate Actions Required

• Update Adobe InDesign Desktop to the latest patched version immediately
• Advise users to avoid opening InDesign files from untrusted or unknown sources
• Implement file type filtering on email gateways to quarantine InDesign files for scanning
• Enable Protected View or sandbox modes if available when opening files from external sources

Patch Information

Adobe has released security updates addressing this vulnerability. Refer to the Adobe InDesign Security Advisory (APSB26-32) for the latest patched versions and update instructions. Organizations should prioritize updating all InDesign installations to versions newer than 20.5.2 (for the 20.x branch) or 21.2 (for the 21.x branch).

Workarounds

• Restrict InDesign file handling to trusted sources only until patches can be applied
• Use sandboxed environments or virtual machines when opening InDesign files from external parties
• Implement strict email attachment policies to block or quarantine InDesign document formats
• Consider using Adobe Creative Cloud's automatic update feature to ensure timely patch deployment

Organizations should ensure the Adobe Creative Cloud desktop application is configured to automatically install updates. Verify the current InDesign version by navigating to Help > About InDesign and confirm it is running a version later than those listed as affected.