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MEDIUM severity

ImageMagick: Heap Buffer Over-Write in JP2 encoder when due to incorrect handling of argumentsGHSA-c4v7-w88g-m6c4

MEDIUM

GHSA-c4v7-w88g-m6c4 is a medium-severity (CVSS 5.5) CWE-682 vulnerability in Magick.NET-Q16-AnyCPU. A fix is available for Magick.NET-Q16-AnyCPU — see the affected versions and patch details below.

Also known asCVE-2026-55597
Published
Updated
Affected
17 pkgs
Patched
17 / 17
Exploits
None indexed
Exploitation data as of Oct 22, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-c4v7-w88g-m6c4.

EPSS Exploitation Probability

via FIRST.org ↗
0.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs1th percentile — riskier than 1% of all scored CVEsHighest risk
0.00%0.22%0.43%0.65%0.1%0.1%0.1%0.1%Aug 26Oct 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-c4v7-w88g-m6c4 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

17 pkgs affected
.NETMagick.NET-Q16-AnyCPU.NETMagick.NET-Q16-HDRI-AnyCPU.NETMagick.NET-Q16-HDRI-OpenMP-arm64.NETMagick.NET-Q16-HDRI-x64.NETMagick.NET-Q16-HDRI-x86.NETMagick.NET-Q16-OpenMP-arm64.NETMagick.NET-Q16-OpenMP-x64.NETMagick.NET-Q16-arm64+9 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 is free and open-source software used for editing and manipulating digital images. Prior to version 7.1.2-26, an incorrect handling of arguments can cause a heap buffer over-write in the JP2 encoder. This issue has been fixed in version7.1.2-26.

Affected Packages

17 total 17 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMagick.NET-Q16-AnyCPUall versions14.15.0dotnet add package Magick.NET-Q16-AnyCPU --version 14.15.0
.NETNuGetMagick.NET-Q16-HDRI-AnyCPUall versions14.15.0dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.15.0
.NETNuGetMagick.NET-Q16-HDRI-OpenMP-arm64all versions14.15.0dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.15.0
.NETNuGetMagick.NET-Q16-HDRI-x64all versions14.15.0dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.15.0
.NETNuGetMagick.NET-Q16-HDRI-x86all versions14.15.0dotnet add package Magick.NET-Q16-HDRI-x86 --version 14.15.0
.NETNuGetMagick.NET-Q16-OpenMP-arm64all versions14.15.0dotnet add package Magick.NET-Q16-OpenMP-arm64 --version 14.15.0

Affected Products

1 product · 1 configurations
Application
imagemagickimagemagick
< 7.1.2-26
range

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, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update Magick.NET-Q16-AnyCPU to 14.15.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c4v7-w88g-m6c4 is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate
Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: Red Hat security advisory for GHSA-c4v7-w88g-m6c4 (CC BY 4.0)

Frequently Asked Questions

Due to incorrect handling of arguments a heap buffer over-write can occur in the JP2 encoder.
O3 Security · Impact-Aware SCA

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ImageMagick: Heap Buffer Over-Write in JP2 encoder…