CVE-2026-53460: ImageMagick DOS Vulnerability

CVE-2026-53460 Overview

CVE-2026-53460 affects ImageMagick, an open-source software suite used for editing and manipulating digital images. The vulnerability stems from a missing check for maximum memory request in the AcquireAlignedMemory function. An attacker can trigger an out-of-memory condition by submitting a crafted image that causes the library to attempt an unbounded allocation. This issue affects versions prior to 6.9.13-50 and 7.1.2-25, and is classified under [CWE-770] (Allocation of Resources Without Limits or Throttling). The flaw is exploitable over the network without authentication or user interaction, impacting availability of any service that processes untrusted images through ImageMagick.

Critical Impact

Remote attackers can trigger denial of service through memory exhaustion by submitting crafted images to applications that use ImageMagick for processing.

Affected Products

• ImageMagick versions prior to 6.9.13-50
• ImageMagick versions prior to 7.1.2-25
• Applications and services that embed ImageMagick for image processing

Discovery Timeline

• 2026-06-10 - CVE-2026-53460 published to NVD
• 2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-53460

Vulnerability Analysis

The vulnerability resides in ImageMagick's AcquireAlignedMemory function, which allocates aligned memory blocks used throughout the library for image buffers and pixel data. The function lacks a check against the configured maximum memory request limit. When a request exceeds available system memory, the allocation proceeds without bounds enforcement, leading to memory exhaustion or process termination.

This class of issue falls under [CWE-770], where a resource allocator fails to enforce limits on resource consumption. ImageMagick is commonly deployed as a backend image processor in web applications, content management systems, and document conversion pipelines. Any of these contexts expose the flaw to remote, unauthenticated input.

Root Cause

The root cause is the absence of a memory-cap validation step inside AcquireAlignedMemory before invoking the underlying allocator. ImageMagick supports policy-driven resource limits through policy.xml, but the missing check meant aligned allocations bypassed those guardrails. Fixed releases 6.9.13-50 and 7.1.2-25 add the maximum memory request validation to prevent oversized requests from reaching the allocator.

Attack Vector

An attacker delivers a crafted image file to a service that processes it with a vulnerable ImageMagick version. The image triggers AcquireAlignedMemory to compute an allocation size that exceeds practical memory limits. The resulting out-of-memory condition crashes the process or starves co-located services. No authentication is required, and the attack can be repeated to sustain a denial-of-service condition against image processing endpoints.

No verified public proof-of-concept is available. See the GitHub Security Advisory for technical details.

Detection Methods for CVE-2026-53460

Indicators of Compromise

• Repeated process termination or OOM-killer events targeting ImageMagick worker processes (convert, magick, identify)
• Sudden spikes in resident memory usage by web application workers that invoke ImageMagick
• Application logs showing failed image conversion jobs with allocation errors immediately followed by service restarts

Detection Strategies

• Inventory all deployed ImageMagick binaries and libraries; flag any version below 6.9.13-50 (6.x branch) or 7.1.2-25 (7.x branch)
• Monitor kernel logs (dmesg, /var/log/syslog) for Out of memory: Killed process entries referencing ImageMagick utilities
• Inspect upload endpoints for anomalous image submissions with mismatched declared dimensions or malformed headers

Monitoring Recommendations

• Track per-process memory ceilings on image processing workers and alert on threshold breaches
• Forward ImageMagick policy violations and allocation failures to a central logging platform for correlation
• Establish baselines for normal image conversion job duration and memory footprint, then alert on outliers

How to Mitigate CVE-2026-53460

Immediate Actions Required

• Upgrade ImageMagick to version 6.9.13-50 or 7.1.2-25 or later across all systems
• Audit container images, build pipelines, and third-party applications for bundled vulnerable ImageMagick libraries
• Restrict image processing workers with cgroup memory limits to contain the impact of allocation failures

Patch Information

The maintainers fixed the issue in ImageMagick 6.9.13-50 and 7.1.2-25 by adding the missing maximum memory request check inside AcquireAlignedMemory. Refer to the ImageMagick GitHub Security Advisory GHSA-q62c-h75r-2xhc for full release details and source references.

Workarounds

• Tighten ImageMagick's policy.xml to enforce strict memory, map, width, height, and area resource limits
• Validate image dimensions and file size at the application layer before invoking ImageMagick
• Run ImageMagick conversions inside isolated, memory-capped sandboxes or containers to prevent host-wide exhaustion

# Configuration example: tighten /etc/ImageMagick-7/policy.xml resource limits
<policymap>
  <policy domain="resource" name="memory" value="256MiB"/>
  <policy domain="resource" name="map" value="512MiB"/>
  <policy domain="resource" name="width" value="16KP"/>
  <policy domain="resource" name="height" value="16KP"/>
  <policy domain="resource" name="area" value="128MP"/>
  <policy domain="resource" name="disk" value="1GiB"/>
</policymap>