GHSA-xwc6-v6g8-pw2h CVE-2026-25966
ImageMagick's Security Policy Bypass through config/policy-secure.xml via "fd handler" leads to stdin/stdout access
High
NuGet
- Severity
- 5.9 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 0.15%
- Chance of exploitation in the next 30 days. Higher than 4.45% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-284 Improper Access Control
- Fix
- Available
- 17 packages have a fixed version
Description
The shipped “secure” security policy includes a rule intended to prevent reading/writing from standard streams:
<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.
<policy domain="path" rights="none" pattern="fd:*"/>
And this will also be included in ImageMagick's more secure policies by default.
Affected versions
NuGet
| Package | Vulnerable | Fixed in |
|---|---|---|
| Magick.NET-Q16-AnyCPU | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-HDRI-AnyCPU | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-HDRI-OpenMP-arm64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-HDRI-arm64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-HDRI-x64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-HDRI-x86 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-OpenMP-arm64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-OpenMP-x64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-OpenMP-x86 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-arm64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q16-x64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q8-AnyCPU | < 14.10.3 |
14.10.3 |
| Magick.NET-Q8-OpenMP-arm64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q8-OpenMP-x64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q8-arm64 | < 14.10.3 |
14.10.3 |
| Magick.NET-Q8-x86 | < 14.10.3 |
14.10.3 |
| Magick.NET-QMagick.NET-Q16-x8616-x64 | < 14.10.3 |
14.10.3 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
Magick.NET-Q16-AnyCPU NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-AnyCPU --version 14.10.3
Magick.NET-Q16-HDRI-AnyCPU NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.10.3
Magick.NET-Q16-HDRI-OpenMP-arm64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.10.3
Magick.NET-Q16-HDRI-arm64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.10.3
Magick.NET-Q16-HDRI-x64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.10.3
Magick.NET-Q16-HDRI-x86 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-HDRI-x86 --version 14.10.3
Magick.NET-Q16-OpenMP-arm64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-OpenMP-arm64 --version 14.10.3
Magick.NET-Q16-OpenMP-x64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-OpenMP-x64 --version 14.10.3
Magick.NET-Q16-OpenMP-x86 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-OpenMP-x86 --version 14.10.3
Magick.NET-Q16-arm64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-arm64 --version 14.10.3
Magick.NET-Q16-x64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q16-x64 --version 14.10.3
Magick.NET-Q8-AnyCPU NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q8-AnyCPU --version 14.10.3
Magick.NET-Q8-OpenMP-arm64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q8-OpenMP-arm64 --version 14.10.3
Magick.NET-Q8-OpenMP-x64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q8-OpenMP-x64 --version 14.10.3
Magick.NET-Q8-arm64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q8-arm64 --version 14.10.3
Magick.NET-Q8-x86 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-Q8-x86 --version 14.10.3
Magick.NET-QMagick.NET-Q16-x8616-x64 NuGet → 14.10.3
- dotnet
dotnet add package Magick.NET-QMagick.NET-Q16-x8616-x64 --version 14.10.3
Severity breakdown
CVSS 3.1 5.9
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Weakness
CWE-284: Improper Access Control
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
How to prevent it
- Architecture and Design, Operation: Very carefully manage the setting, management, and handling of privileges. Explicitly manage trust zones in the software.
- Architecture and Design: Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area. Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
References
Advisories
Packages
Other links
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-j7hp-h8jx-5ppr libwebp: OOB write in BuildHuffmanTable | High Known exploited | Also affects magick.net-q16-anycpu |
| GHSA-cvhv-g4rq-3hmw ImageMagick: Memory Leak when providing invalid options to the cli | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-h22j-f9xw-xjjm ImageMagick: Integer Overflow in JNX decoder causes heap buffer over-write when processing extremly large files on 32-bit builds | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-422r-8c97-xcg4 ImageMagick: Heap Buffer Over-Write in fx operation | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-f5m7-cqgw-8hm7 ImageMagick: Heap Buffer Over-Write in morphology operation when an invalid kernel is provided | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-hc76-7mpc-qjqh ImageMagick: Code injection in HTML encoder due to incomplete fix of CVE-2026-25797 | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-56m6-8q75-f2rw ImageMagick: Policy Bypass due to an incomplete fix of CVE-2026-49219 | Medium | Also affects Magick.NET-Q16-AnyCPU |
| GHSA-h5r4-w88w-7ccr ImageMagick: Memory Leak in TIFF encoder when invalid tiff:tile-geometry is specified | Low | Also affects Magick.NET-Q16-AnyCPU |
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