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ImageMagick has a Heap Buffer Over-Write in MAT decoder on 32-bit systems

Moderate severity GitHub Reviewed Published May 30, 2026 in ImageMagick/ImageMagick • Updated Jun 25, 2026

Package

nuget Magick.NET-Q16-AnyCPU (NuGet)

Affected versions

< 14.14.0

Patched versions

14.14.0
nuget Magick.NET-Q16-HDRI-AnyCPU (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-HDRI-arm64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-HDRI-x64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-HDRI-x86 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-OpenMP-arm64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-OpenMP-x64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-arm64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-x64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q16-x86 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q8-AnyCPU (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q8-OpenMP-arm64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q8-OpenMP-x64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q8-arm64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q8-x64 (NuGet)
< 14.14.0
14.14.0
nuget Magick.NET-Q8-x86 (NuGet)
< 14.14.0
14.14.0

Description

A missing check of a return value could lead to a heap buffer over-write in the MAT decoder on 32-bit systems.

References

@dlemstra dlemstra published to ImageMagick/ImageMagick May 30, 2026
Published by the National Vulnerability Database Jun 10, 2026
Published to the GitHub Advisory Database Jun 25, 2026
Reviewed Jun 25, 2026
Last updated Jun 25, 2026

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(14th percentile)

Weaknesses

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Learn more on MITRE.

CVE ID

CVE-2026-48994

GHSA ID

GHSA-4v89-6mgq-6rgc

Source code

Credits

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