CVE-2026-25985: ImageMagick DOS Vulnerability

CVE-2026-25985 Overview

ImageMagick, a widely-used open-source software suite for editing and manipulating digital images, contains a memory exhaustion vulnerability in its SVG parsing functionality. Prior to versions 7.1.2-15 and 6.9.13-40, a specially crafted SVG file containing a malicious element can cause ImageMagick to attempt to allocate approximately 674 GB of memory, resulting in an out-of-memory abort condition. This resource exhaustion vulnerability can be exploited remotely to trigger denial of service conditions on systems processing untrusted SVG files.

Critical Impact

Remote attackers can crash ImageMagick instances by submitting malicious SVG files, potentially disrupting image processing services, web applications, and automated workflows that rely on ImageMagick for image manipulation.

Affected Products

• ImageMagick versions prior to 7.1.2-15
• ImageMagick versions prior to 6.9.13-40
• Applications and services utilizing vulnerable ImageMagick libraries for SVG processing

Discovery Timeline

• 2026-02-24 - CVE-2026-25985 published to NVD
• 2026-02-25 - Last updated in NVD database

Technical Details for CVE-2026-25985

Vulnerability Analysis

This vulnerability is classified as CWE-770 (Allocation of Resources Without Limits or Throttling). The flaw exists in ImageMagick's SVG file parsing logic, where improper validation of input parameters allows an attacker to craft an SVG file that triggers an excessive memory allocation request. When ImageMagick processes the malicious SVG element, it attempts to allocate approximately 674 GB of memory without proper bounds checking, causing the application to abort due to memory exhaustion.

The network-accessible nature of this vulnerability means that any service accepting SVG uploads or processing SVG files from untrusted sources is potentially at risk. The attack requires no authentication or user interaction, making it particularly dangerous for automated image processing pipelines and web applications.

Root Cause

The root cause stems from insufficient input validation in ImageMagick's SVG parser. When processing certain SVG elements, the parser fails to enforce reasonable limits on memory allocation requests derived from user-controlled input parameters. This allows maliciously crafted dimension or element specifications to trigger allocation requests that far exceed available system memory, causing the process to crash with an out-of-memory condition.

Attack Vector

The attack vector is network-based, requiring an attacker to submit a crafted SVG file to a vulnerable ImageMagick instance. This can occur through:

• Web application file upload functionality
• Image processing APIs that accept SVG input
• Email processing systems that render SVG attachments
• Content management systems that process user-uploaded images
• Automated image conversion workflows

The attacker crafts an SVG file with specific malicious elements designed to trigger the excessive memory allocation. When ImageMagick attempts to parse and process this file, the memory exhaustion occurs, causing immediate denial of service. For detailed technical information about the vulnerability mechanism, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-25985

Indicators of Compromise

• Sudden memory spikes on systems running ImageMagick during SVG processing
• Out-of-memory errors or process crashes in ImageMagick-related services
• Unusual SVG file uploads with abnormally large specified dimensions
• Application logs showing failed image conversions with memory allocation errors

Detection Strategies

• Monitor system memory utilization for sudden, extreme allocation attempts
• Implement file upload scanning to identify suspicious SVG files before processing
• Configure application logging to capture ImageMagick processing errors and failures
• Deploy endpoint detection rules to identify patterns of DoS attempts targeting image processors

Monitoring Recommendations

• Set up alerts for ImageMagick process crashes or abnormal terminations
• Monitor memory allocation patterns during image processing operations
• Track SVG file processing metrics for anomalous behavior patterns
• Implement resource limits and cgroups for ImageMagick processes to contain impact

How to Mitigate CVE-2026-25985

Immediate Actions Required

• Upgrade ImageMagick to version 7.1.2-15 or later (for 7.x branch)
• Upgrade ImageMagick to version 6.9.13-40 or later (for 6.x branch)
• Restrict SVG file processing from untrusted sources until patching is complete
• Implement memory limits for ImageMagick processes using system resource controls

Patch Information

ImageMagick has released patched versions that address this vulnerability. Users should update to version 7.1.2-15 or later for the 7.x branch, or version 6.9.13-40 or later for the 6.x branch. The patches implement proper bounds checking on memory allocation requests during SVG parsing to prevent excessive allocations. For more details, see the GitHub Security Advisory.

Workarounds

• Disable SVG processing entirely using ImageMagick policy files if not required
• Implement strict file type validation and reject SVG files from untrusted sources
• Configure resource limits in policy.xml to restrict maximum memory allocation
• Use containerization or sandboxing to isolate ImageMagick processes and limit blast radius

# Configuration example - ImageMagick policy.xml resource limits
# Add to /etc/ImageMagick-7/policy.xml or /etc/ImageMagick-6/policy.xml

# Disable SVG processing entirely
# <policy domain="coder" rights="none" pattern="SVG" />

# Or set memory limits to prevent exhaustion
# <policy domain="resource" name="memory" value="256MiB"/>
# <policy domain="resource" name="map" value="512MiB"/>
# <policy domain="resource" name="disk" value="1GiB"/>