Use After Free Affecting magick.net-q8-x64 package, versions [0,]
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-MAGICKNETQ8X64-17954586
- published12 Jul 2026
- disclosed11 Jul 2026
- creditRigelYoung
Introduced: 11 Jul 2026
NewCVE-2026-61861 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Magick.NET-Q8-x64 is a Magick.NET allows you can use ImageMagick without having to install ImageMagick on your server or desktop.
More information about specific builds see the [official docs] (https://github.com/dlemstra/Magick.NET/tree/main/docs)
Affected versions of this package are vulnerable to Use After Free via the FormatMagickCaption function in MagickCore/annotate.c. An attacker can trigger a dangling-pointer dereference by supplying caption text that drives the memory-allocation failure path during caption formatting. When ReplaceSpaceWithNewline(caption, s) fails, FormatMagickCaption continues using the stale s pointer, which still refers to freed memory. This can crash the application while processing the image caption and disrupt any operation that renders or converts the affected image.
Notes
- The vulnerable path is only reachable during caption formatting when
ReplaceSpaceWithNewline(caption, s)returns a replacement buffer; deployments that never exercise caption rendering/annotation through this code path are not exposed. - The issue is tied to the memory-failure branch inside
FormatMagickCaption, so it depends on an allocation failure while processing the caption text rather than ordinary caption content alone.