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LOW severity

ImageMagick: Heap-based Buffer Overflow in GetPixelIndex due to metadata-cache desynchronizationGHSA-gq5v-qf8q-fp77

LOW

GHSA-gq5v-qf8q-fp77 is a low-severity (CVSS 3.3) Out-of-bounds Read 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-2026-56362
Published
Updated
Affected
19 pkgs
Patched
19 / 19
Exploits
None indexed
Exploitation data as of Nov 6, 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-gq5v-qf8q-fp77.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs9th percentile — riskier than 9% of all scored CVEsHighest risk
0.00%0.23%0.46%0.69%0.2%0.2%0.2%0.2%0.2%Aug 26Oct 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

19 pkgs affected
.NETMagick.NET-Q16-AnyCPU.NETMagick.NET-Q16-HDRI-AnyCPU.NETMagick.NET-Q16-HDRI-OpenMP-arm64.NETMagick.NET-Q16-HDRI-OpenMP-x64.NETMagick.NET-Q16-HDRI-arm64.NETMagick.NET-Q16-HDRI-x64.NETMagick.NET-Q16-HDRI-x86.NETMagick.NET-Q16-OpenMP-arm64+11 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 before 7.1.2-15 contains a heap-buffer-overflow read vulnerability in GetPixelIndex caused by OpenPixelCache updating image channel metadata before pixel cache memory allocation. Attackers can trigger memory and disk allocation failures to cause a heap-buffer-overflow read affecting any writer calling GetPixelIndex.

Affected Packages

19 total 19 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMagick.NET-Q16-AnyCPUall versions14.10.3dotnet add package Magick.NET-Q16-AnyCPU --version 14.10.3
.NETNuGetMagick.NET-Q16-HDRI-AnyCPUall versions14.10.3dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.10.3
.NETNuGetMagick.NET-Q16-HDRI-OpenMP-arm64all versions14.10.3dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.10.3
.NETNuGetMagick.NET-Q16-HDRI-OpenMP-x64all versions14.10.3dotnet add package Magick.NET-Q16-HDRI-OpenMP-x64 --version 14.10.3
.NETNuGetMagick.NET-Q16-HDRI-arm64all versions14.10.3dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.10.3
.NETNuGetMagick.NET-Q16-HDRI-x64all versions14.10.3dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.10.3

Affected Products

1 product · 2 configurations
Application
imagemagickimagemagick
≥ 7.0.0-0 && < 7.1.2-15
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 14.10.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gq5v-qf8q-fp77 is resolved across your whole dependency graph.

  3. Workarounds

    Stop feeding it untrusted input: reject or quarantine files and payloads from unverified sources until you can upgrade, restrict accepted formats to the ones you actually need, and run the parsing or decoding step in a least-privileged sandbox or short-lived worker so a crash or corrupted read cannot reach the rest of the process.

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 HatLow

This vulnerability in ImageMagick is rated as Low impact. A heap-buffer-overflow read can occur in the `GetPixelIndex` function if `OpenPixelCache` updates image channel metadata before memory allocation, and both memory and disk allocation subsequently fail. Exploitation requires an attacker to trigger these specific…

Workaround published by Red Hat
Isolate ImageMagick tasks by running them inside unprivileged containers (such as Podman) with strict SELinux confinement. Alternatively, sanitize untrusted files using an intermediate script to strip complex metadata before passing them to ImageMagick.
Source: Red Hat security advisory for GHSA-gq5v-qf8q-fp77 (CC BY 4.0)

Frequently Asked Questions

`OpenPixelCache` updates image channel metadata **before** attempting pixel cache memory allocation. When both memory and disk allocation fail a heap-buffer-overflow read in occurs in any writer that calls `GetPixelIndex`.
O3 Security · Impact-Aware SCA

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