CVE-2026-33899: Magick.NET Q16 AnyCPU ImageMagick Has A Heap-Buffer-Overflow Write Vulnerability

MODERATE
Advisory Identifier: GHSA-cr67-pvmx-2pp2
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CVSS 5.3
CWE-191 CWE-122
Published
Advisory Summary

CVE-2026-33899 is a MODERATE (CVSS 5.3) imagemagick has a heap-buffer-overflow write vulnerability (CWE-191: Integer Underflow (Wrap or Wraparound)) affecting Magick.NET Q16 AnyCPU libraries in the NuGet ecosystem. The issue involves imagemagick has a heap-buffer-overflow write of a single zero byte when parsing xml.. Remediation is available by upgrading affected packages to version 14.12.0.

CVE-2026-33899 at a Glance

CVE Identifier CVE-2026-33899
GHSA Identifier GHSA-cr67-pvmx-2pp2
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-191: Integer Underflow (Wrap or Wraparound)
Affected Product Magick.NET Q16 AnyCPU
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 5.3

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

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
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-2026-33899

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: 14.12.0 
Upgrade Magick.NET-Q16-AnyCPU to 14.12.0
Magick.NET-Q16-HDRI-AnyCPU fixed: 14.12.0 
Upgrade Magick.NET-Q16-HDRI-AnyCPU to 14.12.0
Magick.NET-Q16-HDRI-OpenMP-arm64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-HDRI-OpenMP-arm64 to 14.12.0
Magick.NET-Q16-HDRI-arm64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-HDRI-arm64 to 14.12.0
Magick.NET-Q16-HDRI-x64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-HDRI-x64 to 14.12.0
Magick.NET-Q16-HDRI-x86 fixed: 14.12.0 
Upgrade Magick.NET-Q16-HDRI-x86 to 14.12.0
Magick.NET-Q16-OpenMP-arm64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-OpenMP-arm64 to 14.12.0
Magick.NET-Q16-OpenMP-x64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-OpenMP-x64 to 14.12.0
Magick.NET-Q16-arm64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-arm64 to 14.12.0
Magick.NET-Q16-x64 fixed: 14.12.0 
Upgrade Magick.NET-Q16-x64 to 14.12.0
Magick.NET-Q16-x86 fixed: 14.12.0 
Upgrade Magick.NET-Q16-x86 to 14.12.0
Magick.NET-Q8-AnyCPU fixed: 14.12.0 
Upgrade Magick.NET-Q8-AnyCPU to 14.12.0
Magick.NET-Q8-OpenMP-arm64 fixed: 14.12.0 
Upgrade Magick.NET-Q8-OpenMP-arm64 to 14.12.0
Magick.NET-Q8-OpenMP-x64 fixed: 14.12.0 
Upgrade Magick.NET-Q8-OpenMP-x64 to 14.12.0
Magick.NET-Q8-arm64 fixed: 14.12.0 
Upgrade Magick.NET-Q8-arm64 to 14.12.0
Magick.NET-Q8-x64 fixed: 14.12.0 
Upgrade Magick.NET-Q8-x64 to 14.12.0
Magick.NET-Q8-x86 fixed: 14.12.0 
Upgrade Magick.NET-Q8-x86 to 14.12.0
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-2026-33899, 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 14.12.0), 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-191: Integer Underflow (Wrap or Wraparound), where the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. 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

When `Magick` parses an XML file it is possible that a single zero byte is written out of the bounds.

CVE-2026-33899 Affected Magick.NET Q16 AnyCPU Versions

17 component(s)
Fixed Versions:
14.12.0
Product / Package Ecosystem Affected Versions Fixed Version
Magick.NET-Q16-AnyCPU
nuget/Magick.NET-Q16-AnyCPU
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-HDRI-AnyCPU
nuget/Magick.NET-Q16-HDRI-AnyCPU
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-HDRI-OpenMP-arm64
nuget/Magick.NET-Q16-HDRI-OpenMP-arm64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-HDRI-arm64
nuget/Magick.NET-Q16-HDRI-arm64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-HDRI-x64
nuget/Magick.NET-Q16-HDRI-x64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-HDRI-x86
nuget/Magick.NET-Q16-HDRI-x86
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-OpenMP-arm64
nuget/Magick.NET-Q16-OpenMP-arm64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-OpenMP-x64
nuget/Magick.NET-Q16-OpenMP-x64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-arm64
nuget/Magick.NET-Q16-arm64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-x64
nuget/Magick.NET-Q16-x64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q16-x86
nuget/Magick.NET-Q16-x86
NuGet
< 14.12.0
14.12.0
Magick.NET-Q8-AnyCPU
nuget/Magick.NET-Q8-AnyCPU
NuGet
< 14.12.0
14.12.0
Magick.NET-Q8-OpenMP-arm64
nuget/Magick.NET-Q8-OpenMP-arm64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q8-OpenMP-x64
nuget/Magick.NET-Q8-OpenMP-x64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q8-arm64
nuget/Magick.NET-Q8-arm64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q8-x64
nuget/Magick.NET-Q8-x64
NuGet
< 14.12.0
14.12.0
Magick.NET-Q8-x86
nuget/Magick.NET-Q8-x86
NuGet
< 14.12.0
14.12.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-cr67-pvmx-2pp2
NVD — CVE-2026-33899 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33899
Security Fix Commit FIX COMMIT
https://github.com/ImageMagick/ImageMagick/commit/ae679e2fd19ec656bfab9f822ae4cf06bf91604d
Magick.NET Q16 AnyCPU Source Repository REPOSITORY
https://github.com/ImageMagick/ImageMagick
Magick.NET Q16 AnyCPU Release RELEASE
https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19
Magick.NET Q16 AnyCPU Release RELEASE
https://github.com/dlemstra/Magick.NET/releases/tag/14.12.0

Frequently Asked Questions

What is CVE-2026-33899?
CVE-2026-33899 is a security vulnerability in Magick.NET Q16 AnyCPU involving ImageMagick has a heap-Buffer-Overflow write of a single zero byte when parsing xml. under CWE-191: Integer Underflow (Wrap or Wraparound).
Which Magick.NET Q16 AnyCPU versions are affected?
Affected versions include releases prior to 14.12.0 across affected packages: Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU, Magick.NET-Q16-HDRI-OpenMP-arm64, 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-arm64, Magick.NET-Q16-x64, Magick.NET-Q16-x86, 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-2026-33899?
Upgrading to 14.12.0 (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 14.12.0. Upgrade your dependency to 14.12.0 or later.
Is Magick.NET-Q16-HDRI-AnyCPU affected?
Yes, Magick.NET-Q16-HDRI-AnyCPU is affected in releases prior to 14.12.0. Upgrade your dependency to 14.12.0 or later.
What is the CVSS score of CVE-2026-33899?
CVE-2026-33899 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2026-33899?
CVE-2026-33899 is classified under CWE-191: Integer Underflow (Wrap or Wraparound) (The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.).
How can I check NuGet dependencies for CVE-2026-33899?
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-cr67-pvmx-2pp2",
  "modified" : "2026-04-15T20:56:24Z",
  "published" : "2026-04-13T19:33:00Z",
  "aliases" : [ "CVE-2026-33899" ],
  "summary" : "ImageMagick has a heap-Buffer-Overflow write of a single zero byte when parsing xml.",
  "details" : "When `Magick` parses an XML file it is possible that a single zero byte is written out of the bounds.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
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  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-cr67-pvmx-2pp2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-33899"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImageMagick/ImageMagick/commit/ae679e2fd19ec656bfab9f822ae4cf06bf91604d"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ImageMagick/ImageMagick"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dlemstra/Magick.NET/releases/tag/14.12.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-122", "CWE-191" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-13T19:33:00Z",
    "nvd_published_at" : "2026-04-13T21:16:25Z"
  }
}