5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-26983

CVE-2026-26983: ImageMagick: Invalid MSL <map> can result in a use after free

The MSL interpreter crashes when processing a invalid <map> element that causes it to use an image after it has been freed.

(GitHub Advisory)

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CVE-2026-26983

CVE-2026-26983:

5.3

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	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-AnyCPU	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-OpenMP-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-OpenMP-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-HDRI-x86	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-OpenMP-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-OpenMP-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-OpenMP-x86	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q16-x86	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-AnyCPU	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-OpenMP-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-OpenMP-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-arm64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-x64	nuget	< 14.10.3	14.10.3
Magick.NET-Q8-x86	nuget	< 14.10.3	14.10.3

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The analysis of the security advisory and the associated commit 7cfae4da24a995fb05386d77364ff404a7cca7bc directly points to the MSLStartElement function in coders/msl.c as the location of the vulnerability. The patch explicitly modifies this function to add a check for the affinity_image before it is used by the RemapImages function. The vulnerability description confirms that an invalid <map> element in an MSL file triggers a use-after-free condition. The MSLStartElement function is the entry point for processing these elements, making it the primary vulnerable function. During exploitation, a profiler would show MSLStartElement in the stack trace when the malicious MSL file is parsed.

Vulnerable functions

MSLStartElement

coders/msl.c

The vulnerability lies in the `MSLStartElement` function, which is responsible for parsing Magick Scripting Language (MSL) files. When processing a `<map>` element, the function would unconditionally call `RemapImages` and then `DestroyImage` on the `affinity_image` pointer. A specially crafted MSL file with an invalid `<map>` element could result in `affinity_image` being an invalid or previously freed pointer. The subsequent call to `RemapImages` would then lead to a use-after-free vulnerability. The patch mitigates this by adding a null check, ensuring that `RemapImages` and `DestroyImage` are only called if `affinity_image` is a valid pointer.

Vulnerability Intelligence
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WAF Protection Rules

WAF Rule

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Reasoning

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