CVE-2026-21354: DNG SDK Integer Overflow DoS Vulnerability

CVE-2026-21354 Overview

CVE-2026-21354 is an Integer Overflow or Wraparound vulnerability (CWE-190) affecting Adobe DNG SDK versions 1.7.1 2410 and earlier. This vulnerability could lead to application denial-of-service conditions when processing specially crafted DNG (Digital Negative) files.

Critical Impact

Successful exploitation allows attackers to crash applications or render them unresponsive by causing an integer overflow during file processing.

Affected Products

• Adobe DNG SDK version 1.7.1 2410
• Adobe DNG SDK earlier versions
• Applications incorporating vulnerable DNG SDK versions

Discovery Timeline

• February 10, 2026 - CVE-2026-21354 published to NVD
• February 10, 2026 - Last updated in NVD database

Technical Details for CVE-2026-21354

Vulnerability Analysis

This vulnerability stems from improper handling of integer arithmetic operations within the DNG SDK's file parsing routines. When processing DNG image files, the SDK performs calculations that can result in integer overflow or wraparound conditions when maliciously crafted input values are provided.

Integer overflow vulnerabilities occur when arithmetic operations produce values that exceed the maximum representable value for a given integer type, causing the value to "wrap around" to a small or negative number. In the context of the DNG SDK, this can lead to incorrect memory allocations, buffer size miscalculations, or unexpected program states that trigger application crashes.

The local attack vector with required user interaction indicates that exploitation requires a victim to open a malicious DNG file. This makes the vulnerability particularly relevant in scenarios where users process untrusted image files, such as photographers working with files from external sources or applications that automatically process uploaded images.

Root Cause

The root cause is an Integer Overflow or Wraparound vulnerability (CWE-190) in the DNG SDK's image processing code. When the SDK parses certain fields or dimensions within a DNG file, it performs arithmetic operations without adequate validation to prevent integer overflow conditions. Attackers can craft DNG files with specific values designed to trigger these overflow conditions during processing.

Attack Vector

The attack requires local access and user interaction. An attacker must craft a malicious DNG file and convince a victim to open it using an application that incorporates the vulnerable DNG SDK. The attack flow typically involves:

The attacker creates a specially crafted DNG file containing values designed to trigger integer overflow during parsing. When a victim opens this file with a vulnerable application, the SDK attempts to process the malformed data. The integer overflow causes incorrect calculations, leading to unexpected program behavior and ultimately causing the application to crash or become unresponsive.

Detection Methods for CVE-2026-21354

Indicators of Compromise

• Unexpected application crashes when opening DNG image files from untrusted sources
• Abnormal memory consumption patterns in applications using the DNG SDK
• Core dumps or crash reports indicating integer-related errors in DNG processing routines
• Repeated application hangs or freezes during image file processing

Detection Strategies

• Monitor for unexpected application terminations with error codes related to memory or arithmetic operations
• Implement file integrity monitoring on systems that process large volumes of DNG files
• Use application crash analysis tools to identify patterns consistent with integer overflow exploitation
• Deploy endpoint detection solutions capable of identifying malformed file processing attempts

Monitoring Recommendations

• Enable detailed logging for applications that process DNG files to capture processing failures
• Configure crash reporting mechanisms to alert on repeated application failures
• Monitor file access patterns for suspicious DNG files, particularly from external or untrusted sources
• Implement sandboxing for applications that process untrusted image files

How to Mitigate CVE-2026-21354

Immediate Actions Required

• Update Adobe DNG SDK to the latest patched version as specified in the Adobe security bulletin
• Review applications that incorporate the DNG SDK and prioritize updates
• Implement user awareness training about the risks of opening untrusted image files
• Consider restricting DNG file processing to trusted sources until patches are applied

Patch Information

Adobe has released a security update addressing this vulnerability. Detailed patch information is available in the Adobe Security Bulletin APSB26-23. Organizations using the DNG SDK should review this advisory and apply the recommended updates immediately.

Workarounds

• Restrict processing of DNG files from untrusted or unknown sources until the SDK is updated
• Implement application sandboxing to limit the impact of potential crashes on system stability
• Configure applications to validate DNG files before full processing where possible
• Use file filtering at the network perimeter to inspect DNG files from external sources

# Example: Verify DNG SDK version in application dependencies
# Check linked library versions
ldd /path/to/application | grep -i dng

# On macOS, use otool
otool -L /path/to/application | grep -i dng