CVE-2026-53466: ImageMagick DOS Vulnerability

CVE-2026-53466 Overview

CVE-2026-53466 is an integer overflow vulnerability [CWE-190] in the XCF decoder of ImageMagick, a widely used open-source image manipulation library. The flaw affects versions prior to 6.9.13-51 and 7.1.2-26. When ImageMagick processes a crafted XCF image, the integer overflow triggers an out-of-bounds read that can crash the process. Attackers deliver a malicious image over the network to any service that renders untrusted XCF content, including web applications, thumbnailers, and image processing pipelines.

Critical Impact
A remote attacker can cause a denial-of-service crash and potentially disclose limited memory contents by supplying a crafted XCF file to an application using vulnerable ImageMagick versions.

Affected Products

ImageMagick versions prior to 6.9.13-51
ImageMagick versions prior to 7.1.2-26
Applications and services embedding vulnerable ImageMagick builds for XCF decoding

Discovery Timeline

2026-07-01 - CVE-2026-53466 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-53466

Vulnerability Analysis

The vulnerability resides in ImageMagick's decoder for the XCF format, the native file format used by GIMP. During decoding, the library computes buffer sizes or offsets from attacker-controlled fields in the image header. An arithmetic operation on these values overflows the fixed-width integer type, producing a small or negative result. Subsequent code trusts this value when indexing into pixel or tile buffers, resulting in an out-of-bounds read past allocated memory. The read can dereference unmapped memory and terminate the process, producing a denial-of-service condition. Depending on how the calling application handles decoded pixel data, adjacent heap contents may also be reflected back to the attacker.

Root Cause

The root cause is missing validation of arithmetic operations on untrusted image metadata inside the XCF reader. Width, height, tile, or channel counts read from the file are multiplied or added without checking for wraparound, violating safe integer handling principles associated with [CWE-190]. The overflowed value is then used as a size parameter for read operations.

Attack Vector

Exploitation requires an attacker to deliver a crafted XCF file to a target that decodes it with a vulnerable ImageMagick version. No authentication or user interaction beyond normal file submission is required. Common attack surfaces include image upload endpoints, avatar processors, document conversion services, and command-line pipelines invoking convert or magick on attacker-supplied files.

No verified public proof-of-concept code is available. See the GitHub Security Advisory GHSA-pjxj-pchx-4c3m for technical details.

Detection Methods for CVE-2026-53466

Indicators of Compromise

Unexpected crashes or segmentation faults in processes invoking ImageMagick binaries such as convert, magick, or identify
Ingestion of .xcf files at endpoints that typically only receive common web image formats
Repeated malformed XCF submissions from the same source address to image upload services

Detection Strategies

Inventory installed ImageMagick versions across servers and containers and flag builds below 6.9.13-51 or 7.1.2-26
Inspect application logs and core dumps for abnormal terminations correlated with XCF file processing
Deploy file-type validation at ingress and alert when XCF payloads reach processors that do not require the format

Monitoring Recommendations

Forward ImageMagick process telemetry and crash events to a centralized logging platform for correlation
Monitor container image builds and package manifests for outdated ImageMagick dependencies
Track upload endpoints for anomalous file sizes or malformed headers targeting image conversion workers

How to Mitigate CVE-2026-53466

Immediate Actions Required

Upgrade ImageMagick to version 6.9.13-51 or 7.1.2-26 or later across all systems and container images
Audit downstream applications, packages, and Docker base images that bundle ImageMagick and rebuild with the patched release
Restrict accepted image formats at application ingress to those actually required by the service

Patch Information

ImageMagick maintainers fixed the integer overflow in versions 6.9.13-51 and 7.1.2-26. Details are published in the GitHub Security Advisory GHSA-pjxj-pchx-4c3m. Apply distribution updates through the operating system package manager and rebuild any statically linked applications.

Workarounds

Disable the XCF coder in the ImageMagick policy file when the format is not required by the application
Reject uploads matching the XCF magic bytes at the web application firewall or reverse proxy layer
Run ImageMagick within a sandboxed process or container with strict resource limits to contain crashes

bash

# /etc/ImageMagick-7/policy.xml - disable the XCF coder
<policymap>
  <policy domain="coder" rights="none" pattern="XCF" />
</policymap>