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CVE-2026-56366

CVE-2026-56366 is a CWE-401 vulnerability in Magick.NET-Q16-AnyCPU. O3 Security confirms whether CVE-2026-56366 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

ImageMagick - Memory Leak in META Reader APP1JPEG Error Path

Also known asGHSA-9r56-3gjq-hqf7
Published
Jul 10, 2026
Updated
Aug 4, 2026
Affected
18 pkgs
Patched
18 / 18
Exploits
None indexed

Blast Radius

18 pkgs affected
.NETMagick.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+10 more

Real-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 before 7.1.2-18 contains a memory leak vulnerability in the META reader when processing APP1JPEG input paths. Attackers can trigger this memory leak by providing specially crafted APP1JPEG image files, causing denial of service through resource exhaustion.

Affected Packages

18 total 18 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMagick.NET-Q16-AnyCPUall versions14.11.1
.NETNuGetMagick.NET-Q16-HDRI-AnyCPUall versions14.11.1
.NETNuGetMagick.NET-Q16-HDRI-OpenMP-arm64all versions14.11.1
.NETNuGetMagick.NET-Q16-HDRI-arm64all versions14.11.1
.NETNuGetMagick.NET-Q16-HDRI-x64all versions14.11.1
.NETNuGetMagick.NET-Q16-HDRI-x86all versions14.11.1

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for Magick.NET-Q16-AnyCPU. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update Magick.NET-Q16-AnyCPU to 14.11.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-56366 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether CVE-2026-56366 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2026-56366. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

ImageMagick before 7.1.2-18 contains a memory leak vulnerability in the META reader when processing APP1JPEG input paths. Attackers can trigger this memory leak by providing specially crafted APP1JPEG image files, causing denial of service through resource exhaustion.
O3 Security · Impact-Aware SCA

Is CVE-2026-56366 in your dependencies?

O3 detects CVE-2026-56366 across NuGet dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.