CVE-2026-46520: ImageMagick Heap Buffer Over-Write Vulnerability

HIGH
Advisory Identifier: GHSA-36wm-hprc-mcf5
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CVSS 7.5
CWE-122 CWE-787
Published
Advisory Summary

CVE-2026-46520 is a HIGH (CVSS 7.5) heap buffer over-write vulnerability (CWE-122: Heap-based Buffer Overflow) affecting ImageMagick libraries in the NuGet ecosystem. The issue involves heap buffer over-write in ipl decoder when reading multiple images of different dimensions. Remediation is available by upgrading affected packages to version 14.13.1.

CVE-2026-46520 at a Glance

CVE Identifier CVE-2026-46520
GHSA Identifier GHSA-36wm-hprc-mcf5
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-122: Heap-based Buffer Overflow
Affected Product ImageMagick
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:H).

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 High (A:H)

How to Fix CVE-2026-46520

To remediate this vulnerability, upgrade all affected ImageMagick 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: 14.13.1 
Upgrade Magick.NET-Q16-AnyCPU to 14.13.1
Magick.NET-Q16-HDRI-AnyCPU fixed: 14.13.1 
Upgrade Magick.NET-Q16-HDRI-AnyCPU to 14.13.1
Magick.NET-Q16-HDRI-OpenMP-arm64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-HDRI-OpenMP-arm64 to 14.13.1
Magick.NET-Q16-HDRI-OpenMP-x64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-HDRI-OpenMP-x64 to 14.13.1
Magick.NET-Q16-HDRI-arm64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-HDRI-arm64 to 14.13.1
Magick.NET-Q16-HDRI-x64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-HDRI-x64 to 14.13.1
Magick.NET-Q16-HDRI-x86 fixed: 14.13.1 
Upgrade Magick.NET-Q16-HDRI-x86 to 14.13.1
Magick.NET-Q16-OpenMP-arm64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-OpenMP-arm64 to 14.13.1
Magick.NET-Q16-OpenMP-x64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-OpenMP-x64 to 14.13.1
Magick.NET-Q16-arm64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-arm64 to 14.13.1
Magick.NET-Q16-x64 fixed: 14.13.1 
Upgrade Magick.NET-Q16-x64 to 14.13.1
Magick.NET-Q16-x86 fixed: 14.13.1 
Upgrade Magick.NET-Q16-x86 to 14.13.1
Magick.NET-Q8-AnyCPU fixed: 14.13.1 
Upgrade Magick.NET-Q8-AnyCPU to 14.13.1
Magick.NET-Q8-OpenMP-arm64 fixed: 14.13.1 
Upgrade Magick.NET-Q8-OpenMP-arm64 to 14.13.1
Magick.NET-Q8-OpenMP-x64 fixed: 14.13.1 
Upgrade Magick.NET-Q8-OpenMP-x64 to 14.13.1
Magick.NET-Q8-arm64 fixed: 14.13.1 
Upgrade Magick.NET-Q8-arm64 to 14.13.1
Magick.NET-Q8-x64 fixed: 14.13.1 
Upgrade Magick.NET-Q8-x64 to 14.13.1
Magick.NET-Q8-x86 fixed: 14.13.1 
Upgrade Magick.NET-Q8-x86 to 14.13.1
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-2026-46520, inspect your project dependencies for ImageMagick:

inspect dependencies for Magick.NET-Q16-AnyCPU

Analyze the terminal output to locate any version of ImageMagick in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 14.13.1), 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-122: Heap-based Buffer Overflow, where a heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). In ImageMagick, 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 reading multiple images with different dimensions an out of bounds heap write can occur.

CVE-2026-46520 Affected ImageMagick Versions

18 component(s)
Fixed Versions:
14.13.1
Product / Package Ecosystem Affected Versions Fixed Version
Magick.NET-Q16-AnyCPU
nuget/Magick.NET-Q16-AnyCPU
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-HDRI-AnyCPU
nuget/Magick.NET-Q16-HDRI-AnyCPU
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-HDRI-OpenMP-arm64
nuget/Magick.NET-Q16-HDRI-OpenMP-arm64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-HDRI-OpenMP-x64
nuget/Magick.NET-Q16-HDRI-OpenMP-x64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-HDRI-arm64
nuget/Magick.NET-Q16-HDRI-arm64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-HDRI-x64
nuget/Magick.NET-Q16-HDRI-x64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-HDRI-x86
nuget/Magick.NET-Q16-HDRI-x86
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-OpenMP-arm64
nuget/Magick.NET-Q16-OpenMP-arm64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-OpenMP-x64
nuget/Magick.NET-Q16-OpenMP-x64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-arm64
nuget/Magick.NET-Q16-arm64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-x64
nuget/Magick.NET-Q16-x64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q16-x86
nuget/Magick.NET-Q16-x86
NuGet
< 14.13.1
14.13.1
Magick.NET-Q8-AnyCPU
nuget/Magick.NET-Q8-AnyCPU
NuGet
< 14.13.1
14.13.1
Magick.NET-Q8-OpenMP-arm64
nuget/Magick.NET-Q8-OpenMP-arm64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q8-OpenMP-x64
nuget/Magick.NET-Q8-OpenMP-x64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q8-arm64
nuget/Magick.NET-Q8-arm64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q8-x64
nuget/Magick.NET-Q8-x64
NuGet
< 14.13.1
14.13.1
Magick.NET-Q8-x86
nuget/Magick.NET-Q8-x86
NuGet
< 14.13.1
14.13.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-36wm-hprc-mcf5
NVD — CVE-2026-46520 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46520
ImageMagick Source Repository REPOSITORY
https://github.com/ImageMagick/ImageMagick

Frequently Asked Questions

What is CVE-2026-46520?
CVE-2026-46520 is a security vulnerability in ImageMagick involving Heap Buffer Over-Write in IPL decoder when reading multiple images of different dimensions under CWE-122: Heap-based Buffer Overflow.
Which ImageMagick versions are affected?
Affected versions include releases prior to 14.13.1 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-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-2026-46520?
Upgrading to 14.13.1 (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 14.13.1. Upgrade your dependency to 14.13.1 or later.
Is Magick.NET-Q16-HDRI-AnyCPU affected?
Yes, Magick.NET-Q16-HDRI-AnyCPU is affected in releases prior to 14.13.1. Upgrade your dependency to 14.13.1 or later.
What is the CVSS score of CVE-2026-46520?
CVE-2026-46520 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2026-46520?
CVE-2026-46520 is classified under CWE-122: Heap-based Buffer Overflow (A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().).
How can I check NuGet dependencies for CVE-2026-46520?
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-36wm-hprc-mcf5",
  "modified" : "2026-06-11T14:04:54Z",
  "published" : "2026-05-18T20:36:47Z",
  "aliases" : [ "CVE-2026-46520" ],
  "summary" : "ImageMagick: Heap Buffer Over-Write in IPL decoder when reading multiple images of different dimensions",
  "details" : "When reading multiple images with different dimensions an out of bounds heap write can occur.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-AnyCPU"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-AnyCPU"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-OpenMP-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-OpenMP-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-x86"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-OpenMP-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-OpenMP-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-x86"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q8-AnyCPU"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q8-OpenMP-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q8-OpenMP-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q8-arm64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q8-x64"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q8-x86"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "14.13.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-36wm-hprc-mcf5"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-46520"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ImageMagick/ImageMagick"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-122", "CWE-787" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-18T20:36:47Z",
    "nvd_published_at" : "2026-06-10T22:16:59Z"
  }
}