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ImageMagick: Heap Buffer Over-Write in MIFF encoder when using LZMA compression

Moderate severity GitHub Reviewed Published May 17, 2026 in ImageMagick/ImageMagick • Updated May 18, 2026

Package

nuget Magick.NET-Q16-AnyCPU (NuGet)

Affected versions

< 14.13.1

Patched versions

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

Description

When using LZMA compression in the MIFF encoder an out of bounds write can occur due to a missing check.

References

@dlemstra dlemstra published to ImageMagick/ImageMagick May 17, 2026
Published to the GitHub Advisory Database May 18, 2026
Reviewed May 18, 2026
Last updated May 18, 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
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
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:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS score

Weaknesses

Incorrect Calculation of Buffer Size

The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow. Learn more on MITRE.

Unchecked Return Value

The product does not check the return value from a method or function, which can prevent it from detecting unexpected states and conditions. Learn more on MITRE.

Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer. Learn more on MITRE.

Loop with Unreachable Exit Condition ('Infinite Loop')

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. Learn more on MITRE.

CVE ID

CVE-2026-46521

GHSA ID

GHSA-jcqp-6r6f-3mfx

Source code

Credits

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