CVE-2026-56376: Magick.NET Q16 AnyCPU ImageMagick Has A Possible Heap Vulnerability

LOW
Advisory Identifier: GHSA-2gq3-ww97-wfjm
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CVSS 3.7
CWE-416
Published
Advisory Summary

CVE-2026-56376 is a LOW (CVSS 3.7) imagemagick has a possible heap vulnerability (CWE-416: Use After Free) affecting Magick.NET Q16 AnyCPU libraries in the NuGet ecosystem. The issue involves imagemagick has a possible heap use after free vulnerability in its meta coder. Remediation is available by upgrading affected packages to version 14.10.3.

CVE-2026-56376 at a Glance

CVE Identifier CVE-2026-56376
GHSA Identifier GHSA-2gq3-ww97-wfjm
Severity LOW
CVSS v3.1 Base Score 3.7
CWE Classification CWE-416: Use After Free
Affected Product Magick.NET Q16 AnyCPU
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 3.7

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2026-56376

To remediate this vulnerability, upgrade all affected Magick.NET Q16 AnyCPU dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

Magick.NET-Q16-AnyCPU fixed: 14.10.3 
Upgrade Magick.NET-Q16-AnyCPU to 14.10.3
Magick.NET-Q16-HDRI-AnyCPU fixed: 14.10.3 
Upgrade Magick.NET-Q16-HDRI-AnyCPU to 14.10.3
Magick.NET-Q16-HDRI-OpenMP-arm64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-HDRI-OpenMP-arm64 to 14.10.3
Magick.NET-Q16-HDRI-OpenMP-x64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-HDRI-OpenMP-x64 to 14.10.3
Magick.NET-Q16-HDRI-arm64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-HDRI-arm64 to 14.10.3
Magick.NET-Q16-HDRI-x64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-HDRI-x64 to 14.10.3
Magick.NET-Q16-HDRI-x86 fixed: 14.10.3 
Upgrade Magick.NET-Q16-HDRI-x86 to 14.10.3
Magick.NET-Q16-OpenMP-arm64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-OpenMP-arm64 to 14.10.3
Magick.NET-Q16-OpenMP-x64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-OpenMP-x64 to 14.10.3
Magick.NET-Q16-OpenMP-x86 fixed: 14.10.3 
Upgrade Magick.NET-Q16-OpenMP-x86 to 14.10.3
Magick.NET-Q16-arm64 fixed: 14.10.3 
Upgrade Magick.NET-Q16-arm64 to 14.10.3
Magick.NET-Q8-AnyCPU fixed: 14.10.3 
Upgrade Magick.NET-Q8-AnyCPU to 14.10.3
Magick.NET-Q8-OpenMP-arm64 fixed: 14.10.3 
Upgrade Magick.NET-Q8-OpenMP-arm64 to 14.10.3
Magick.NET-Q8-OpenMP-x64 fixed: 14.10.3 
Upgrade Magick.NET-Q8-OpenMP-x64 to 14.10.3
Magick.NET-Q8-arm64 fixed: 14.10.3 
Upgrade Magick.NET-Q8-arm64 to 14.10.3
Magick.NET-Q8-x64 fixed: 14.10.3 
Upgrade Magick.NET-Q8-x64 to 14.10.3
Magick.NET-Q8-x86 fixed: 14.10.3 
Upgrade Magick.NET-Q8-x86 to 14.10.3
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for Magick.NET-Q16-AnyCPU

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-56376, inspect your project dependencies for Magick.NET Q16 AnyCPU:

inspect dependencies for Magick.NET-Q16-AnyCPU

Analyze the terminal output to locate any version of Magick.NET Q16 AnyCPU in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 14.10.3), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-416: Use After Free, where the product reuses or references memory after it has been freed. at some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. In Magick.NET Q16 AnyCPU, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

A heap Use After Free vulnerability exists in the meta coder when an allocation fails and a single byte is written to a stale pointer. ``` ==535852==ERROR: AddressSanitizer: heap-use-after-free on address 0x5210000088ff at pc 0x5581bacac14d bp 0x7ffdf667edf0 sp 0x7ffdf667ede0 WRITE of size 1 at 0x5210000088ff thread T0 ```

CVE-2026-56376 Affected Magick.NET Q16 AnyCPU Versions

17 component(s)
Fixed Versions:
14.10.3
Product / Package Ecosystem Affected Versions Fixed Version
Magick.NET-Q16-AnyCPU
nuget/Magick.NET-Q16-AnyCPU
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-HDRI-AnyCPU
nuget/Magick.NET-Q16-HDRI-AnyCPU
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-HDRI-OpenMP-arm64
nuget/Magick.NET-Q16-HDRI-OpenMP-arm64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-HDRI-OpenMP-x64
nuget/Magick.NET-Q16-HDRI-OpenMP-x64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-HDRI-arm64
nuget/Magick.NET-Q16-HDRI-arm64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-HDRI-x64
nuget/Magick.NET-Q16-HDRI-x64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-HDRI-x86
nuget/Magick.NET-Q16-HDRI-x86
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-OpenMP-arm64
nuget/Magick.NET-Q16-OpenMP-arm64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-OpenMP-x64
nuget/Magick.NET-Q16-OpenMP-x64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-OpenMP-x86
nuget/Magick.NET-Q16-OpenMP-x86
NuGet
< 14.10.3
14.10.3
Magick.NET-Q16-arm64
nuget/Magick.NET-Q16-arm64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q8-AnyCPU
nuget/Magick.NET-Q8-AnyCPU
NuGet
< 14.10.3
14.10.3
Magick.NET-Q8-OpenMP-arm64
nuget/Magick.NET-Q8-OpenMP-arm64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q8-OpenMP-x64
nuget/Magick.NET-Q8-OpenMP-x64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q8-arm64
nuget/Magick.NET-Q8-arm64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q8-x64
nuget/Magick.NET-Q8-x64
NuGet
< 14.10.3
14.10.3
Magick.NET-Q8-x86
nuget/Magick.NET-Q8-x86
NuGet
< 14.10.3
14.10.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-2gq3-ww97-wfjm
NVD — CVE-2026-56376 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56376
Security Fix Commit FIX COMMIT
https://github.com/ImageMagick/ImageMagick/commit/f5049954f12c6fcf090a776767526d2a4708d58b
Magick.NET Q16 AnyCPU Source Repository REPOSITORY
https://github.com/ImageMagick/ImageMagick
www.vulncheck.com/advisories/imagemag... WEB
https://www.vulncheck.com/advisories/imagemagick-heap-use-after-free-in-meta-coder

Frequently Asked Questions

What is CVE-2026-56376?
CVE-2026-56376 is a security vulnerability in Magick.NET Q16 AnyCPU involving ImageMagick has a possible heap Use After Free vulnerability in its meta coder under CWE-416: Use After Free.
Which Magick.NET Q16 AnyCPU versions are affected?
Affected versions include releases prior to 14.10.3 across affected packages: Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU, Magick.NET-Q16-HDRI-OpenMP-arm64, Magick.NET-Q16-HDRI-OpenMP-x64, Magick.NET-Q16-HDRI-arm64, Magick.NET-Q16-HDRI-x64, Magick.NET-Q16-HDRI-x86, Magick.NET-Q16-OpenMP-arm64, Magick.NET-Q16-OpenMP-x64, Magick.NET-Q16-OpenMP-x86, Magick.NET-Q16-arm64, Magick.NET-Q8-AnyCPU, Magick.NET-Q8-OpenMP-arm64, Magick.NET-Q8-OpenMP-x64, Magick.NET-Q8-arm64, Magick.NET-Q8-x64, Magick.NET-Q8-x86.
What version fixes CVE-2026-56376?
Upgrading to 14.10.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Magick.NET-Q16-AnyCPU affected?
Yes, Magick.NET-Q16-AnyCPU is affected in releases prior to 14.10.3. Upgrade your dependency to 14.10.3 or later.
Is Magick.NET-Q16-HDRI-AnyCPU affected?
Yes, Magick.NET-Q16-HDRI-AnyCPU is affected in releases prior to 14.10.3. Upgrade your dependency to 14.10.3 or later.
What is the CVSS score of CVE-2026-56376?
CVE-2026-56376 has a CVSS v3.1 base score of 3.7 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-56376?
CVE-2026-56376 is classified under CWE-416: Use After Free (The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.).
How can I check NuGet dependencies for CVE-2026-56376?
Run the dependency tree command: 'inspect dependencies for Magick.NET-Q16-AnyCPU'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2gq3-ww97-wfjm",
  "modified" : "2026-09-24T20:04:20Z",
  "published" : "2026-02-25T19:11:50Z",
  "aliases" : [ "CVE-2026-56376" ],
  "summary" : "ImageMagick has a possible heap Use After Free vulnerability in its meta coder",
  "details" : "A heap Use After Free vulnerability exists in the meta coder when an allocation fails and a single byte is written to a stale pointer.\n\n```\n==535852==ERROR: AddressSanitizer: heap-use-after-free on address 0x5210000088ff at pc 0x5581bacac14d bp 0x7ffdf667edf0 sp 0x7ffdf667ede0\nWRITE of size 1 at 0x5210000088ff thread T0\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
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  "references" : [ {
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  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-56376"
  }, {
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  } ],
  "database_specific" : {
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    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-25T19:11:50Z",
    "nvd_published_at" : null
  }
}