6.2

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-46523

CVE-2026-46523: ImageMagick: Use-After-Free in MSL decoder.

A crafted MSL image can trigger a heap-use-after-free.

(GitHub Advisory)

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CVE-2026-46523

CVE-2026-46523:

6.2

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	< 14.13.1	14.13.1
Magick.NET-Q16-HDRI-AnyCPU	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-HDRI-OpenMP-arm64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-HDRI-OpenMP-x64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-HDRI-arm64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-HDRI-x64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-HDRI-x86	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-OpenMP-arm64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-OpenMP-x64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-arm64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-x64	nuget	< 14.13.1	14.13.1
Magick.NET-Q16-x86	nuget	< 14.13.1	14.13.1
Magick.NET-Q8-AnyCPU	nuget	< 14.13.1	14.13.1
Magick.NET-Q8-OpenMP-arm64	nuget	< 14.13.1	14.13.1
Magick.NET-Q8-OpenMP-x64	nuget	< 14.13.1	14.13.1
Magick.NET-Q8-arm64	nuget	< 14.13.1	14.13.1
Magick.NET-Q8-x64	nuget	< 14.13.1	14.13.1
Magick.NET-Q8-x86	nuget	< 14.13.1	14.13.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a use-after-free in the MSL decoder of ImageMagick, identified by GHSA-5r4x-w6p5-222q. The analysis of the patch associated with this vulnerability, specifically commit 4d92249c84536a20e9723376ec016b4950dcb454, reveals that the fix involves modifying the RegisterMSLImage function in coders/msl.c. The change disables the CoderBlobSupportFlag for the MSL format. This indicates that the vulnerability is triggered when an MSL image is read from a blob. The function responsible for decoding MSL images is ReadMSLImage, as set in the RegisterMSLImage function. Therefore, ReadMSLImage is the function that contains the use-after-free vulnerability. During exploitation, a crafted MSL image provided as a blob would be processed by ReadMSLImage, triggering the memory corruption. The patch prevents this by disallowing the MSL decoder from reading from blobs altogether.

Vulnerable functions

ReadMSLImage

coders/msl.c

The vulnerability is a use-after-free that occurs in the MSL decoder when processing a crafted MSL image. The patch mitigates this by disabling the ability to read MSL images from blobs. `ReadMSLImage` is the function responsible for decoding MSL images, and therefore contains the vulnerable code that is triggered when processing a malicious MSL image from a blob, leading to a use-after-free condition.

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WAF Protection Rules

WAF Rule

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Reasoning

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