Heap Buffer Overflow in ImageMagick via FTXT Encoder

Compliance Impact

This vulnerability in ImageMagick allows for a heap buffer overflow that can lead to denial of service or information disclosure through crafted FTXT image files.

However, the impact is limited to availability with no direct consequences for confidentiality or integrity, which are critical factors for compliance with standards like GDPR or HIPAA.

Since the vulnerability does not directly compromise confidentiality or integrity of data, it has limited implications for compliance with regulations focused on protecting personal or sensitive information.

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Executive Summary

CVE-2026-56374 is a heap buffer overflow vulnerability in the FTXT encoder of ImageMagick versions before 7.1.2-19. It occurs because of missing boundary checks when parsing the ftxt:format parameter, which can lead to an out-of-bounds read.

Remote attackers can exploit this vulnerability by crafting malicious FTXT image files, causing the program to read memory outside the intended buffer.

This flaw is classified under CWE-125 (Out-of-bounds Read) and has a low severity score.

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Impact Analysis

Exploitation of this vulnerability can lead to denial of service or information disclosure.

The impact is primarily on availability, as the vulnerability can cause the application to crash or behave unexpectedly.

There are no direct impacts on confidentiality or integrity according to the available information.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade ImageMagick to version 7.1.2-19 or later, where the heap buffer overflow in the FTXT encoder has been patched.

Avoid processing untrusted or malicious FTXT image files that could exploit the missing boundary checks in the ftxt:format parameter.

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