ImageMagick: Heap Buffer Over-Write in MIFF encoder when using LZMA compression — CVE-2026-46521

Summary

When using LZMA compression in the MIFF encoder an out of bounds write can occur due to a missing check.

Product

nuget: Magick.NET-Q16-AnyCPU | nuget: Magick.NET-Q16-HDRI-AnyCPU | nuget: Magick.NET-Q16-HDRI-OpenMP-arm64 | nuget: Magick.NET-Q16-HDRI-OpenMP-x64 | nuget: Magick.NET-Q16-HDRI-arm64 | nuget: Magick.NET-Q16-HDRI-x64 | nuget: Magick.NET-Q16-HDRI-x86 | nuget: Magick.NET-Q16-OpenMP-arm64 | +10

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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