5.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-33899

CVE-2026-33899: ImageMagick: Heap BufferOverflow write of single zero byte when parsing XML

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-189 and 6.9.13-44, when Magick parses an XML file it is possible that a single zero byte is written out of the bounds. This issue has been fixed in versions 6.9.13-44 and 7.1.2-19.

(GitHub Advisory)

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CVE-2026-33899

CVE-2026-33899:

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	< 14.12.0	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-OpenMP-x64	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

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Root Cause Analysis

The vulnerability is a heap-based buffer overflow in the NewXMLTree function located in MagickCore/xml-tree.c. The vulnerability occurs when parsing an XML file. If the parsed XML content results in a UTF-8 string with a length of zero, the original code would attempt to access and write to an out-of-bounds memory location (utf8[-1]). This happens because of the line utf8[length-1] = '\0';. The patch replaces this with utf8[MagickMax(length-1,0)] = '\0';, which prevents the index from becoming negative, thus mitigating the buffer overflow. The vulnerable function NewXMLTree is directly involved in processing the potentially malicious XML input and is the exact location of the flawed logic.

Vulnerable functions

NewXMLTree

MagickCore/xml-tree.c

The vulnerability exists in the `NewXMLTree` function. When parsing an XML file, if the length of the `utf8` string is 0, the code attempts to write a null terminator at `utf8[length-1]`, which is `utf8[-1]`. This leads to a heap-based buffer overflow, writing a single zero byte out of bounds. The patch corrects this by using `MagickMax(length-1, 0)`, ensuring the index is never negative.

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WAF Rule

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Reasoning

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