CVE-2026-55510: ImageMagick Use-After-Free Vulnerability in 8BIM Profile Parsing

Technical summary

A use-after-free condition (CWE-416) exists in ImageMagick's 8BIM profile parsing logic. The flaw occurs during image identification when the parser encounters a malformed 8BIM profile containing a specific format string pattern. This causes the application to reference memory that has already been freed, leading to undefined behavior. The vulnerability is local in nature, requires user interaction to trigger (opening or processing an image), and does not require elevated privileges. The impact is primarily denial of service through application crash or instability.

Business impact

Organizations relying on ImageMagick for automated image processing, web-based image services, or batch image manipulation workflows face potential service disruptions if untrusted image files are processed. While remote code execution is not possible with this vulnerability, denial-of-service conditions could impact availability of systems that depend on continuous image processing. Industries including photography platforms, document management systems, and content delivery services should assess exposure.

Affected systems

ImageMagick versions 6.x prior to 6.9.13-51 and versions 7.x prior to 7.1.2-26 are vulnerable. This includes both standalone installations and instances embedded within other applications or Docker containers. Common deployment vectors include web applications with image upload functionality, command-line batch processing scripts, and server-side image transformation pipelines.

Exploitability

Exploitation requires user interaction—specifically, an application or user must attempt to identify or process the malicious image file. The attack vector is local (file-based), meaning the attacker must deliver the crafted image to the target system. No network-based or unauthenticated remote exploitation is possible. The barrier to exploitation is low once a malicious image is in the processing pipeline, but distribution of that image represents the practical constraint.

Remediation

Upgrade ImageMagick to version 6.9.13-51 or later if using the legacy 6.x branch, or to version 7.1.2-26 or later if using the current 7.x branch. Organizations should verify patch availability through official ImageMagick releases and their respective package managers. For systems where immediate patching is not feasible, implement input validation to reject or quarantine suspicious image files before processing.

Patch guidance

Visit the official ImageMagick website or your operating system's package manager to obtain the patched versions. Verify the update resolves CVE-2026-55510 in the release notes. If deploying ImageMagick within containerized environments, rebuild container images with the patched version and redeploy. For web applications, this may be a dependency update in package management tools (e.g., pip, npm, apt, yum). Test image processing workflows after patching to confirm compatibility with existing workflows.

Detection guidance

Monitor for unexpected crashes or high resource consumption in ImageMagick processes when processing untrusted image files. Log attempts to process image files with suspicious 8BIM profiles or format anomalies. Implement file integrity monitoring on image processing systems. Consider deploying network-based detection on file upload endpoints to identify attempts to upload deliberately malformed image files. Endpoint detection tools may flag process crashes or memory violations associated with ImageMagick.

Why prioritize this

Although this vulnerability carries a MEDIUM CVSS score and does not enable remote code execution, it should be prioritized based on exposure level. Organizations with public-facing image upload functionality or processing services should treat this as higher priority due to ease of distribution of the malicious image. Organizations with internal, controlled image processing workflows may defer patching slightly but should not delay indefinitely. The lack of KEV inclusion suggests exploitation in the wild has not been widespread.

Risk score, explained

The CVSS 3.1 score of 5.5 (MEDIUM) reflects the local attack vector, requirement for user interaction, and limited impact scope (denial of service only). The score does not account for the potential business impact of service disruption in availability-critical image processing pipelines. Organizations should apply their own risk multipliers based on the criticality of image processing to their operations and the likelihood of exposure to untrusted image sources.

Frequently asked questions