How severe is CVE-2026-25638?

CVE-2026-25638 has a CVSS score of 5.3/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2026-25638?

CVE-2026-25638 affects the following packages: Magick.NET-Q16-AnyCPU (NuGet), Magick.NET-Q16-HDRI-AnyCPU (NuGet), Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet), Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet), Magick.NET-Q16-HDRI-arm64 (NuGet), Magick.NET-Q16-HDRI-x64 (NuGet), Magick.NET-Q16-HDRI-x86 (NuGet), Magick.NET-Q16-OpenMP-arm64 (NuGet), and 11 more. Ecosystems affected: NuGet.

How do I fix CVE-2026-25638?

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-2026-25638 is resolved across your whole dependency graph.

How do I detect CVE-2026-25638 in my NuGet dependencies?

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.

How do I mitigate CVE-2026-25638 if there is no patch (or I can't update yet)?

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.

Is CVE-2026-25638 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-25638 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-25638?

CVE-2026-25638 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 31th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-25638?

CVE-2026-25638 is classified as CWE-401 (CWE-401). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-25638 published, and has it been updated?

CVE-2026-25638 was published on February 24, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

.NET

.NET NuGet

Not in CISA KEV

MEDIUM severity

CVE-2026-25638 — Magick.NET-Q16-AnyCPU

MEDIUMFix: ImageMagick/ImageMagick@1e88fca

CVE-2026-25638 is a medium-severity (CVSS 5.3) CWE-401 vulnerability in Magick.NET-Q16-AnyCPU. A fix is available for Magick.NET-Q16-AnyCPU — see the affected versions and patch details below.

ImageMagick has memory leak in msl encoder

Also known asGHSA-gxcx-qjqp-8vjw

Published

Feb 24, 2026

Updated

Oct 28, 2026

Affected

19 pkgs

Patched

19 / 19

Exploits

None indexed

Exploitation data as of Nov 1, 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 CVE-2026-25638.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk-0.05%

Lower risk than most CVEs31th percentile — riskier than 31% of all scored CVEsHighest risk

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

Memory leak exists in coders/msl.c. In the WriteMSLImage function of the msl.c file, resources are allocated. But the function returns early without releasing these allocated resources.

==78983== Memcheck, a memory error detector
==78983== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==78983== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==78983== 
==78983== 177,196 (13,512 direct, 163,684 indirect) bytes in 1 blocks are definitely lost in loss record 21 of 21
==78983==    at 0x4846828: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)

Affected Packages

19 total 19 fixed

Ecosystem	Package	Vulnerable range	Fix
.NETNuGet	`Magick.NET-Q16-AnyCPU`	all versions	14.10.3`dotnet add package Magick.NET-Q16-AnyCPU --version 14.10.3`
.NETNuGet	`Magick.NET-Q16-HDRI-AnyCPU`	all versions	14.10.3`dotnet add package Magick.NET-Q16-HDRI-AnyCPU --version 14.10.3`
.NETNuGet	`Magick.NET-Q16-HDRI-OpenMP-arm64`	all versions	14.10.3`dotnet add package Magick.NET-Q16-HDRI-OpenMP-arm64 --version 14.10.3`
.NETNuGet	`Magick.NET-Q16-HDRI-OpenMP-x64`	all versions	14.10.3`dotnet add package Magick.NET-Q16-HDRI-OpenMP-x64 --version 14.10.3`
.NETNuGet	`Magick.NET-Q16-HDRI-arm64`	all versions	14.10.3`dotnet add package Magick.NET-Q16-HDRI-arm64 --version 14.10.3`
.NETNuGet	`Magick.NET-Q16-HDRI-x64`	all versions	14.10.3`dotnet 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

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.
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-2026-25638 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.

Red HatModerate

A MODERATE impact memory leak exists in ImageMagick's MSL encoder, where unreleased resources can lead to denial of service due to resource exhaustion. This affects Red Hat Enterprise Linux 6 ELS and 7 ELS, where ImageMagick is used for image processing.

Workaround published by Red Hat

To mitigate this issue, avoid processing untrusted MSL (Magick Scripting Language) files with ImageMagick. If ImageMagick is deployed in a server environment, consider implementing resource limits for processes handling image conversions to prevent complete resource exhaustion.

Source: Red Hat security advisory for CVE-2026-25638 (CC BY 4.0)

UbuntuMEDIUM

USN-8263-1Ubuntu

Frequently Asked Questions

Memory leak exists in `coders/msl.c`. In the `WriteMSLImage` function of the `msl.c` file, resources are allocated. But the function returns early without releasing these allocated resources. ``` ==78983== Memcheck, a memory error detector ==78983== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al. ==78983== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info ==78983== ==78983== 177,196 (13,512 direct, 163,684 indirect) bytes in 1 blocks are definitely lost in loss record 21 of 21 ==78983== at 0x4846828: malloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd

O3 Security · Impact-Aware SCA

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Find it across NuGet, including transitive dependencies.

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CVSS Score

5.3/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE Classification

CWE-401CWE-401

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Feb 24, 2026

Last updated

Oct 28, 2026

Identifiers

CVE-2026-25638

GHSA-gxcx-qjqp-8vjw

References

Advisorygithub.com · CVE 2026 25638.json Advisorygithub.com · GHSA gxcx qjqp 8vjw Advisorynvd.nist.gov · CVE 2026 25638 Webgithub.com · 1e88fca11c7b8517100d518bc99bd8c474f02f88 Webgithub.com · 14.10.3 Packagegithub.com · ImageMagick

Related vulnerabilities

This CVE is medium severity; 3 of 8 other CVEs affecting Magick.NET-Q16-AnyCPU are rated as high or higher (top: moderate).

GHSA-cvhv-g4rq-3hmwCVE-2026-53466CVE-2026-62363GHSA-56m6-8q75-f2rwGHSA-6jwg-7q3p-5fqmGHSA-6vxp-gfwf-hcr9GHSA-76q6-2p6h-xjqrGHSA-7c7m-fpjw-gwcq

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026

CVE-2026-25638 — Magick.NET-Q16-AnyCPU

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Fixing This On Your OS

Frequently Asked Questions

Is CVE-2026-25638 in your dependencies?