CVE-2026-25637 is a medium-severity (CVSS 5.3) vulnerability in Magick.NET-Q16-AnyCPU. A fix is available for Magick.NET-Q16-AnyCPU — see the affected versions and patch details below.
ImageMagick: Possible memory leak in ASHLAR encoder
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 CVE-2026-25637.
EPSS Exploitation Probability
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
Magick.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 moreReal-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
A memory leak in the ASHLAR image writer allows an attacker to exhaust process memory by providing a crafted image that results in small objects that are allocated but never freed.
==880062== Memcheck, a memory error detector
==880062== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==880062== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==880062==
==880062==
==880062== HEAP SUMMARY:
==880062== in use at exit: 386,826 bytes in 696 blocks
==880062== total heap usage: 30,523 allocs, 29,827 frees, 21,803,756 bytes allocated
==880062==
==880062== LEAK SUMMARY:
==880062== definitely lost: 3,408 bytes in 3 blocks
==880062== indirectly lost: 88,885 bytes in 30 blocks
==880062== possibly lost: 140,944 bytes in 383 blocks
==880062== still reachable: 151,573 bytes in 259 blocks
==880062== suppressed: 0 bytes in 0 blocks
==880062== Reachable blocks (those to which a pointer was found) are not shown.
==880062== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==880062==
==880062== For lists of detected and suppressed errors, rerun with: -s
==880062== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| .NETNuGet | Magick.NET-Q16-AnyCPU | all versions | 14.10.3dotnet add package Magick.NET-Q16-AnyCPU --version 14.10.3 |
| .NETNuGet | Magick.NET-Q16-HDRI-AnyCPU | all versions | 14.10.3dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.10.3 |
| .NETNuGet | Magick.NET-Q16-HDRI-OpenMP-arm64 | all versions | 14.10.3dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.10.3 |
| .NETNuGet | Magick.NET-Q16-HDRI-OpenMP-x64 | all versions | 14.10.3dotnet add package Magick.NET-Q16-HDRI-OpenMP-x64 --version 14.10.3 |
| .NETNuGet | Magick.NET-Q16-HDRI-arm64 | all versions | 14.10.3dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.10.3 |
| .NETNuGet | Magick.NET-Q16-HDRI-x64 | all versions | 14.10.3dotnet add package Magick.NET-Q16-HDRI-x64 --version 14.10.3 |
Detection & mitigation playbook
Open-source dependencyDetect
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.
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 CVE-2026-25637 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
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.
The impact of this flaw is MODERATE. A memory leak in the ASHLAR image writer component of ImageMagick can be triggered by processing a specially crafted image. This could lead to resource exhaustion and denial of service. This affects Red Hat Enterprise Linux 6 ELS and 7 ELS.
To mitigate this issue, restrict ImageMagick's processing of untrusted or unverified image files. Where possible, process images from unverified sources within a sandboxed environment to contain potential resource exhaustion. Additionally, ensure that applications utilizing ImageMagick implement robust input validation for all image inputs.Source: Red Hat security advisory for CVE-2026-25637 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2026-25637 in your dependencies?
Find it across NuGet, including transitive dependencies.