CVE-2026-42326: ImageMagick Heap Buffer Over-Read Vulnerability

MODERATE
Advisory Identifier: GHSA-7wff-wpr6-vmhm
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CVSS 5.1
CWE-191 CWE-125
Published
Advisory Summary

CVE-2026-42326 is a MODERATE (CVSS 5.1) heap buffer over-read vulnerability (CWE-191: Integer Underflow (Wrap or Wraparound)) affecting ImageMagick libraries in the NuGet ecosystem. The issue involves heap buffer over-read in iptc encoder. Remediation is available by upgrading affected packages to version 14.13.1.

CVE-2026-42326 at a Glance

CVE Identifier CVE-2026-42326
GHSA Identifier GHSA-7wff-wpr6-vmhm
Severity MODERATE
CVSS v3.1 Base Score 5.1
CWE Classification CWE-191: Integer Underflow (Wrap or Wraparound)
Affected Product ImageMagick
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 5.1

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

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

How to Fix CVE-2026-42326

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-2026-42326, 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-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 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 writing an IPTC output file a malicious input file could cause an out of bounds read of a single byte.

CVE-2026-42326 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-7wff-wpr6-vmhm
NVD — CVE-2026-42326 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42326
ImageMagick Source Repository REPOSITORY
https://github.com/ImageMagick/ImageMagick

Frequently Asked Questions

What is CVE-2026-42326?
CVE-2026-42326 is a security vulnerability in ImageMagick involving Heap Buffer Over-Read in IPTC encoder under CWE-191: Integer Underflow (Wrap or Wraparound).
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-2026-42326?
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-2026-42326?
CVE-2026-42326 has a CVSS v3.1 base score of 5.1 (MODERATE) with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
What CWE is associated with CVE-2026-42326?
CVE-2026-42326 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-2026-42326?
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-7wff-wpr6-vmhm",
  "modified" : "2026-06-11T13:30:27Z",
  "published" : "2026-05-18T15:31:56Z",
  "aliases" : [ "CVE-2026-42326" ],
  "summary" : "ImageMagick: Heap Buffer Over-Read in IPTC encoder",
  "details" : "When writing an IPTC output file a malicious input file could cause an out of bounds read of a single byte.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-AnyCPU"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
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      }, {
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      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
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    },
    "ranges" : [ {
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      }, {
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    } ]
  }, {
    "package" : {
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      "name" : "Magick.NET-Q16-HDRI-OpenMP-arm64"
    },
    "ranges" : [ {
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    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-HDRI-OpenMP-x64"
    },
    "ranges" : [ {
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    },
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    "package" : {
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    },
    "ranges" : [ {
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      "events" : [ {
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      }, {
        "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" : [ {
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      "events" : [ {
        "introduced" : "0"
      }, {
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      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Magick.NET-Q16-x64"
    },
    "ranges" : [ {
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      "events" : [ {
        "introduced" : "0"
      }, {
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      } ]
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  }, {
    "package" : {
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      "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-7wff-wpr6-vmhm"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42326"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ImageMagick/ImageMagick"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-125", "CWE-191" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-18T15:31:56Z",
    "nvd_published_at" : "2026-06-10T22:16:57Z"
  }
}