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CVE-2026-25966

ImageMagick's Security Policy Bypass through config/policy-secure.xml via "fd handler" leads to stdin/stdout access

Impact

The shipped “secure” security policy includes a rule intended to prevent reading/writing from standard streams: ```xml <policy domain="path" rights="none" pattern="-"/> ``` However, ImageMagick also supports fd:<n> pseudo-filenames (e.g., fd:0, fd:1). This path form is not blocked by the secure policy templates, and therefore bypasses the protection goal of “no stdin/stdout”. To resolve this, users can add the following change to their security policy. ```xml <policy domain="path" rights="none" pattern="fd:*"/> ``` And this will also be included in ImageMagick's more secure policies by default.

Affected packages

EcosystemPackageAffectedFixed in
nugetMagick.NET-Q16-AnyCPU< 14.10.314.10.3
nugetMagick.NET-Q16-HDRI-AnyCPU< 14.10.314.10.3
nugetMagick.NET-Q16-HDRI-OpenMP-arm64< 14.10.314.10.3
nugetMagick.NET-Q16-HDRI-arm64< 14.10.314.10.3
nugetMagick.NET-Q16-HDRI-x64< 14.10.314.10.3
nugetMagick.NET-Q16-HDRI-x86< 14.10.314.10.3
nugetMagick.NET-Q16-OpenMP-arm64< 14.10.314.10.3
nugetMagick.NET-Q16-OpenMP-x64< 14.10.314.10.3
nugetMagick.NET-Q16-OpenMP-x86< 14.10.314.10.3
nugetMagick.NET-Q16-arm64< 14.10.314.10.3
nugetMagick.NET-Q16-x64< 14.10.314.10.3
nugetMagick.NET-QMagick.NET-Q16-x8616-x64< 14.10.314.10.3
nugetMagick.NET-Q8-AnyCPU< 14.10.314.10.3
nugetMagick.NET-Q8-OpenMP-arm64< 14.10.314.10.3
nugetMagick.NET-Q8-OpenMP-x64< 14.10.314.10.3
nugetMagick.NET-Q8-arm64< 14.10.314.10.3
nugetMagick.NET-Q8-x86< 14.10.314.10.3

Affected products

VendorProductAffected versions
ImagemagickImagemagick
before 6.9.13-40
from 7.0.0-0 before 7.1.2-15

Weakness classification

CWE-284

References