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ImageMagick has has a stack-buffer-overflow in MNG encoder with oversized pallete

Moderate severity GitHub Reviewed Published Apr 13, 2026 in ImageMagick/ImageMagick • Updated Apr 14, 2026

Package

nuget Magick.NET-Q16-AnyCPU (NuGet)

Affected versions

< 14.20.0

Patched versions

14.20.0
nuget Magick.NET-Q16-HDRI-AnyCPU (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-HDRI-arm64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-HDRI-x64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-HDRI-x86 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-OpenMP-arm64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-OpenMP-x64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-arm64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-x64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q16-x86 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q8-AnyCPU (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q8-OpenMP-arm64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q8-OpenMP-x64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q8-arm64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q8-x64 (NuGet)
< 14.20.0
14.20.0
nuget Magick.NET-Q8-x86 (NuGet)
< 14.20.0
14.20.0

Description

The patch for GHSA-7h7q-j33q-hvpf was incomplete and still allows a stack buffer overflow for the multi frame images.

References

@dlemstra dlemstra published to ImageMagick/ImageMagick Apr 13, 2026
Published to the GitHub Advisory Database Apr 14, 2026
Reviewed Apr 14, 2026
Last updated Apr 14, 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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
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:H/PR:N/UI:N/S:U/C:L/I:H/A:H

EPSS score

Weaknesses

Stack-based Buffer Overflow

A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-98cp-rj9f-6v5g

Source code

Credits

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