External risk intelligence

ImageMagick Stack Buffer Overflow Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2026-25968

ImageMagick is a library used by many web applications to process user-uploaded images, making it reachable in some internet-facing deployments. However, it is also frequently used in backend processing pipelines, desktop software, and command-line tools that are not directly exposed to the public internet.

Out-of-bounds Write

Imagemagick

before 6.9.13-407.0.0-0 to before 7.1.2-15

Halo Surface Signal: 3 out of 5 — possibly public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability in ImageMagick, a widely used image processing tool, allows for remote code execution. This could potentially lead to significant compromise if exploited in internet-facing applications.

Flaw lets attackers remotely control software.
Affects widely used image processing tool.
Confirm relevance and exposure to user data.

Attack Path

How an attacker could exploit the issue

An attacker could exploit this vulnerability by sending a specially crafted image file to a system that uses ImageMagick to process it. ImageMagick's inability to properly handle a long 'an' attribute value in a file format can cause a buffer overflow, potentially leading to memory corruption and code execution.

No authentication or user interaction required.
Processing a specially crafted file.
Memory corruption leading to code execution.

Live Threat

Current exploitation, exposure, and threat context

When ImageMagick processes specially crafted image files, a stack buffer overflow can occur. This vulnerability may allow an attacker to corrupt memory, potentially leading to denial of service or, in some scenarios, execution of arbitrary code. The risk is present when ImageMagick is used to process untrusted image inputs, such as user-uploaded content on web applications or files processed in automated workflows.

Image files, application logic.
Malicious input triggers buffer overflow.
Potential for code execution or crash.

Operational Fix

Recommended remediation, mitigation, and detection steps

ImageMagick's stack buffer overflow vulnerability necessitates a coordinated response. Application owners who utilize ImageMagick for image processing, especially for user-uploaded content, should be the first point of contact. Infrastructure or platform teams managing the underlying systems will also play a key role. The immediate priority is to ascertain the presence and reachability of affected ImageMagick instances, confirm their business criticality, and identify the accountable owner to plan remediation activities based on exposure.

Application owners, platform teams should lead.
Verify ImageMagick deployment and reachability.
Plan remediation based on asset criticality.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is ImageMagick?

ImageMagick is a versatile, open-source software suite widely used for creating, editing, and manipulating digital images. It functions as a foundational library or toolkit that developers integrate into web applications, server-side processing pipelines, and command-line tools to automate tasks like resizing, converting formats, or applying filters to user-provided graphics.

How does CVE-2026-25968 cause a security risk?

This vulnerability is a stack-based buffer overflow, classified as CWE-121 and CWE-787. It occurs because the software fails to safely manage the length of an 'an' attribute during image processing. When a file contains an excessively long value for this attribute, it overwrites adjacent memory, causing corruption that can lead to software crashes or unauthorized code execution.

What triggers this vulnerability in ImageMagick?

The flaw is triggered when the software parses a specially crafted image file containing a malicious 'an' attribute. Crucially, the vulnerability is not triggered by simply viewing or storing an image; it requires the software to actively process the file. Systems that do not use the vulnerable msl.c component or that do not process untrusted image inputs are not affected by this specific path.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal notes that while ImageMagick is often used in internal or backend tasks, it is frequently reachable in internet-facing web applications that accept user-uploaded files. Risk is highest if your deployment directly processes untrusted images from the public internet. If your usage is limited to isolated command-line tasks or internal desktop workflows, the direct exposure is lower.

What should I do to secure my environment?

First, identify all instances of ImageMagick in your environment and check their versions. If you are running versions prior to 7.1.2-15 or 6.9.13-40, plan to update immediately to the patched releases provided by the vendor. Coordinate with your development and infrastructure teams to prioritize updating applications that process external or user-supplied image data.

References

github.com/ImageMagick/ImageMagick/security/advisories/GHSA-3mwp…

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.