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MEDIUM severity

ImageMagick: Heap overflow in pcd decoder leads to out of bounds readGHSA-wrhr-rf8j-r842

MEDIUM

GHSA-wrhr-rf8j-r842 is a medium-severity (CVSS 6.5) CWE-122 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-2026-26284
Published
Updated
Affected
19 pkgs
Patched
19 / 19
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • 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-wrhr-rf8j-r842.

EPSS Exploitation Probability

via FIRST.org ↗
0.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs39th percentile — riskier than 39% of all scored CVEsHighest risk
0.00%0.32%0.64%0.96%0.0%0.4%Jun 26Sep 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-arm64.NETMagick.NET-Q16-HDRI-x64.NETMagick.NET-Q16-HDRI-x86.NETMagick.NET-Q16-OpenMP-arm64.NETMagick.NET-Q16-OpenMP-x64+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 is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, ImageMagick lacks proper boundary checking when processing Huffman-coded data from PCD (Photo CD) files. The decoder contains an function that has an incorrect initialization that could cause an out of bounds read. Versions 7.1.2-15 and 6.9.13-40 contain a patch.

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-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
.NETNuGetMagick.NET-Q16-HDRI-x86all versions14.10.3dotnet add package Magick.NET-Q16-HDRI-x86 --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-wrhr-rf8j-r842 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 HatModerate

This MODERATE impact vulnerability in ImageMagick involves a heap overflow in the PCD (Photo CD) decoder, leading to an out-of-bounds read when processing Huffman-coded data. An attacker could exploit this by providing a specially crafted PCD file. Red Hat Enterprise Linux 6 ELS and 7 ELS are affected.

Workaround published by Red Hat
To mitigate this issue, restrict ImageMagick's ability to process PCD (Photo CD) files by disabling the PCD coder. This can be done by adding or modifying a policy entry in the ImageMagick configuration file, typically located at `/etc/ImageMagick-X/policy.xml` (where 'X' is the ImageMagick version). Add the following line within the `<policymap>` tags: ```xml <policy domain="coder" rights="none" pattern="PCD" /> ``` Applications utilizing ImageMagick may require a restart for this change to take effect. This action will prevent ImageMagick from processing PCD files, which may affect functionality dependent on this format.
Source: Red Hat security advisory for GHSA-wrhr-rf8j-r842 (CC BY 4.0)

Frequently Asked Questions

The pcd coder lacks proper boundary checking when processing Huffman-coded data. The decoder contains an function that has an incorrect initialization that could cause an out of bounds read. ``` ==3900053==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x502000003c6c at pc 0x55601b9cc552 bp 0x7ffd904b1f70 sp 0x7ffd904b1f60 READ of size 1 at 0x502000003c6c thread T0 ```
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ImageMagick: Heap overflow in pcd decoder leads to out…