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ImageMagick: Heap Buffer Over-Write in JP2 encoder when due to incorrect handling of arguments

Moderate severity GitHub Reviewed Published Jun 26, 2026 in ImageMagick/ImageMagick • Updated Jul 24, 2026

Package

nuget Magick.NET-Q16-AnyCPU (NuGet)

Affected versions

< 14.15.0

Patched versions

14.15.0
nuget Magick.NET-Q16-HDRI-AnyCPU (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-HDRI-arm64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-HDRI-x64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-HDRI-x86 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-OpenMP-arm64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-OpenMP-x64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-arm64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-x64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q16-x86 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q8-AnyCPU (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q8-OpenMP-arm64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q8-OpenMP-x64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q8-arm64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q8-x64 (NuGet)
< 14.15.0
14.15.0
nuget Magick.NET-Q8-x86 (NuGet)
< 14.15.0
14.15.0

Description

Due to incorrect handling of arguments a heap buffer over-write can occur in the JP2 encoder.

References

@dlemstra dlemstra published to ImageMagick/ImageMagick Jun 26, 2026
Published by the National Vulnerability Database Jul 1, 2026
Published to the GitHub Advisory Database Jul 24, 2026
Reviewed Jul 24, 2026
Last updated Jul 24, 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

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(4th percentile)

Weaknesses

Incorrect Calculation

The product performs a calculation that generates incorrect or unintended results that are later used in security-critical decisions or resource management. 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.

CVE ID

CVE-2026-55597

GHSA ID

GHSA-c4v7-w88g-m6c4

Source code

Credits

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