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ImageMagick: Policy Bypass in APNG encoder and delegates due to a missing check

Low 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 a missing check in the APNG encoder and external delegates it is possibly to bypass the policy and write to a disallowed path.

References

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

Severity

Low

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
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

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:L/UI:N/S:U/C:N/I:L/A:N

EPSS score

Weaknesses

Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource. Learn more on MITRE.

Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-v3j6-27vc-7pw2

Source code

Credits

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