CVE-2026-40183 is a medium-severity (CVSS 5.5) CWE-122 vulnerability in Magick.NET-Q16-AnyCPU. A fix is available for Magick.NET-Q16-AnyCPU — see the affected versions and patch details below.
ImageMagick: Heap buffer overflow when encoding JXL image with a 16-bit float
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-40183.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
Magick.NET-Q16-AnyCPU.NETMagick.NET-Q16-HDRI-AnyCPU.NETMagick.NET-Q16-HDRI-OpenMP-arm64.NETMagick.NET-Q16-HDRI-arm64.NETMagick.NET-Q16-HDRI-x64.NETMagick.NET-Q16-HDRI-x86.NETMagick.NET-Q16-OpenMP-arm64.NETMagick.NET-Q16-OpenMP-x64+9 moreReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.
Description
ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-19, the JXL encoder has an heap write overflow when a user specifies that the image should be encoded as 16 bit floats. This issue has been fixed in version 7.1.2-19.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Magick.NET-Q16-AnyCPU | all versions | 14.12.0dotnet add package Magick.NET-Q16-AnyCPU --version 14.12.0 |
| .NETNuGet | Magick.NET-Q16-HDRI-AnyCPU | all versions | 14.12.0dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.12.0 |
| .NETNuGet | Magick.NET-Q16-HDRI-OpenMP-arm64 | all versions | 14.12.0dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.12.0 |
| .NETNuGet | Magick.NET-Q16-HDRI-arm64 | all versions | 14.12.0dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.12.0 |
| .NETNuGet | Magick.NET-Q16-HDRI-x64 | all versions | 14.12.0dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.12.0 |
| .NETNuGet | Magick.NET-Q16-HDRI-x86 | all versions | 14.12.0dotnet add package Magick.NET-Q16-HDRI-x86 --version 14.12.0 |
Affected Products
imagemagickimagemagickDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Magick.NET-Q16-AnyCPU, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update Magick.NET-Q16-AnyCPU to 14.12.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-40183 is resolved across your whole dependency graph.
Workarounds
Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.Source: Red Hat security advisory for CVE-2026-40183 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2026-40183 in your dependencies?
Find it across NuGet, including transitive dependencies.