5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-40311

CVE-2026-40311: ImageMagick has a heap-use-after-free via XMP profile could result in a crash when printing the values.

An heap use after free when reading an invalid XMP profile could result in a crash due to an heap use after free when printing the values.

(GitHub Advisory)

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CVE-2026-40311

CVE-2026-40311:

5.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
Magick.NET-Q16-AnyCPU	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-AnyCPU	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-OpenMP-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-HDRI-x86	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-OpenMP-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-OpenMP-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q16-x86	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-AnyCPU	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-OpenMP-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-arm64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-x64	nuget	< 14.12.0	14.12.0
Magick.NET-Q8-x86	nuget	< 14.12.0	14.12.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the GetXMPProperty function in MagickCore/property.c. The function parses XMP metadata from an image file. During this process, it extracts property tags and stores them in a splay tree data structure associated with the image. The vulnerability occurs because the function would store a pointer to the property tag string in the splay tree, but the memory for this string was not correctly managed. The string could be freed or modified, leaving a dangling pointer in the splay tree. When this dangling pointer was later accessed (e.g., when printing properties), it would lead to a heap-use-after-free, causing a crash and creating a denial-of-service vulnerability, with a potential for arbitrary code execution.

The patch addresses this by changing how the property is stored. Instead of passing a potentially transient pointer to AddValueToSplayTree, the patched code now passes ConstantString(property), which creates a new, persistent copy of the string for the splay tree. Immediately after, property=DestroyString(property) is called to free the temporary local property string. This ensures that the splay tree has its own managed copy of the string, eliminating the use-after-free condition.

Vulnerable functions

GetXMPProperty

MagickCore/property.c

The function `GetXMPProperty` is vulnerable to a heap-use-after-free. When parsing XMP properties, the function would store a pointer to a property name in a splay tree. However, the memory for this property name was not guaranteed to persist, and could be freed and re-used. Later access to this dangling pointer in the splay tree would result in a use-after-free. The patch corrects this by creating a separate copy of the property string before adding it to the splay tree and then explicitly freeing the temporary string, ensuring the splay tree has its own valid copy.

Vulnerability Intelligence
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WAF Protection Rules

WAF Rule

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Reasoning

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