CVE-2026-28693: ImageMagick Buffer Overflow Vulnerability

CVE-2026-28693 Overview

CVE-2026-28693 is an integer overflow vulnerability in ImageMagick, the widely-used open-source software suite for editing and manipulating digital images. The flaw exists within the DIB (Device Independent Bitmap) coder component and can result in out-of-bounds read or write operations when processing maliciously crafted image files. This vulnerability affects ImageMagick versions prior to 7.1.2-16 and 6.9.13-41.

Critical Impact

Successful exploitation of this integer overflow vulnerability could allow attackers to read or write data outside of intended memory boundaries, potentially leading to information disclosure, denial of service, or arbitrary code execution.

Affected Products

• ImageMagick versions prior to 7.1.2-16
• ImageMagick versions prior to 6.9.13-41
• All applications and services utilizing vulnerable ImageMagick libraries for image processing

Discovery Timeline

• 2026-03-10 - CVE-2026-28693 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-28693

Vulnerability Analysis

This vulnerability is classified as an integer overflow (CWE-125: Out-of-bounds Read) affecting ImageMagick's DIB coder, which handles Windows Device Independent Bitmap format files. The integer overflow occurs during the processing of specially crafted DIB image files, where arithmetic operations on image dimension values can wrap around, causing subsequent memory allocation or access calculations to be incorrect.

The attack requires network access but involves high attack complexity, as the attacker must craft a specific malicious image file and entice a victim or automated service to process it. No authentication or user interaction is required for exploitation, making this vulnerability particularly dangerous in environments where ImageMagick processes untrusted image uploads automatically.

Root Cause

The root cause lies in insufficient validation of integer values during DIB image parsing. When ImageMagick processes a DIB file, it reads header fields containing image dimensions and color depth information. If these values are manipulated to cause an integer overflow during multiplication operations (such as calculating buffer sizes), the resulting value wraps around to a smaller number than expected. This leads to undersized memory allocations that are subsequently overflowed during data copying operations.

Attack Vector

The attack vector is network-based, typically exploited through:

1. Web Applications: Uploading a malicious DIB image to web services that use ImageMagick for image processing, thumbnail generation, or format conversion
2. Email Processing: Sending crafted images via email to systems that automatically process attachments using ImageMagick
3. Document Processing: Embedding malicious images in documents processed by systems utilizing ImageMagick libraries
4. API Endpoints: Targeting image processing APIs that accept DIB format files or perform automatic format detection

The vulnerability allows attackers to trigger out-of-bounds memory access by submitting a crafted DIB file. The specific exploitation depends on whether the overflow results in a read (potentially leaking sensitive memory contents) or write (potentially corrupting memory to achieve code execution) operation. Detailed technical information is available in the ImageMagick Security Advisory.

Detection Methods for CVE-2026-28693

Indicators of Compromise

• Unusual process crashes or segmentation faults in ImageMagick-related processes (convert, identify, mogrify, magick)
• Memory access violation errors in application logs when processing DIB format images
• Unexpected memory consumption patterns during image processing operations
• Core dumps or crash reports indicating memory corruption in ImageMagick libraries

Detection Strategies

• Deploy file integrity monitoring on ImageMagick binary files and libraries to detect unauthorized modifications
• Implement network-level inspection for DIB files with anomalous header values (oversized dimensions, unusual color depth combinations)
• Monitor application logs for ImageMagick error messages related to memory allocation failures or bounds checking
• Use SentinelOne's behavioral AI to detect anomalous process behavior following image file processing

Monitoring Recommendations

• Enable verbose logging for ImageMagick operations in production environments to capture processing anomalies
• Implement real-time monitoring of web upload directories for potentially malicious DIB files
• Set up alerts for unusual resource consumption by ImageMagick processes
• Monitor for child process spawning from ImageMagick binaries, which may indicate exploitation attempts

How to Mitigate CVE-2026-28693

Immediate Actions Required

• Update ImageMagick to version 7.1.2-16 or later for the 7.x branch immediately
• Update ImageMagick to version 6.9.13-41 or later for the 6.x branch if using legacy versions
• Review and restrict ImageMagick policy files to disable DIB coder if not required
• Implement input validation to reject or quarantine DIB format files until patching is complete

Patch Information

ImageMagick has released patched versions that address this integer overflow vulnerability:

• Version 7.1.2-16 for the ImageMagick 7.x branch
• Version 6.9.13-41 for the ImageMagick 6.x branch

Organizations should prioritize upgrading to these fixed versions. For detailed patch information and changelog, refer to the ImageMagick GitHub Security Advisory.

Workarounds

• Disable the DIB coder in ImageMagick's policy.xml configuration file by adding a policy to block the format
• Implement network-level filtering to block or quarantine DIB format files at upload points
• Use application sandboxing (containers, seccomp, AppArmor) to limit ImageMagick process capabilities
• Process untrusted images in isolated environments with restricted memory and system call access

# ImageMagick policy.xml workaround to disable DIB coder
# Add to /etc/ImageMagick-7/policy.xml or equivalent path
# Inside the <policymap> section, add:

<policy domain="coder" rights="none" pattern="DIB" />

# Verify the policy is active:
identify -list policy | grep DIB