Mitigation Strategies

The immediate mitigation step is to upgrade ImageMagick to version 7.1.2-15 or later, where the vulnerability has been patched.

Until the upgrade is applied, avoid processing untrusted or crafted FTXT image files that could exploit this stack-based buffer overflow.

Implement monitoring for crashes or abnormal behavior in ImageMagick processes to detect potential exploitation attempts.

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Executive Summary

CVE-2026-25967 is a high-severity stack-based buffer overflow vulnerability in the ImageMagick FTXT image reader affecting versions prior to 7.1.2-15.

The flaw occurs because the software improperly handles an oversized integer field in a specially crafted FTXT file, which causes out-of-bounds writes on the stack.

This leads to a crash of the program due to overwriting memory beyond the allocated stack buffer.

The vulnerability was detected using AddressSanitizer and is classified as CWE-121 (stack-based buffer overflow).

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Impact Analysis

This vulnerability can be exploited remotely over a network without requiring privileges or user interaction.

While it does not impact confidentiality, it has high impact on integrity and availability, meaning an attacker can cause the ImageMagick process to crash or behave unpredictably.

Such crashes or instability could be used to disrupt services that rely on ImageMagick for image processing.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by monitoring for crashes or abnormal behavior when processing FTXT image files with vulnerable versions of ImageMagick prior to 7.1.2-15.

Detection was originally performed using AddressSanitizer, which identifies stack-buffer-overflow errors during write operations.

To detect if your system is vulnerable, you can check the installed ImageMagick version with the command:

• magick -version

If the version is earlier than 7.1.2-15, your system is vulnerable.

Additionally, you can attempt to process suspicious or crafted FTXT files in a controlled environment to observe if crashes or stack-buffer-overflow errors occur.

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