# ImageMagick: Possible memory leak in ASHLAR encoder

Advisory record · `GHSA-gm37-qx7w-p258`

- **Identifiers:** `GHSA-gm37-qx7w-p258` · `CVE-2026-25637`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-401](https://cwe.mitre.org/data/definitions/401.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 24 Feb 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 Feb 2026, 15:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `Magick.NET-Q16-AnyCPU` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-HDRI-AnyCPU` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-HDRI-OpenMP-arm64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-HDRI-OpenMP-x64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-HDRI-arm64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-HDRI-x64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-HDRI-x86` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-OpenMP-arm64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-OpenMP-x64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-OpenMP-x86` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-arm64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-x64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q16-x86` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q8-AnyCPU` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q8-OpenMP-arm64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q8-OpenMP-x64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q8-arm64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q8-x64` (NuGet): affected `<14.10.3`; fixed in `14.10.3`
- `Magick.NET-Q8-x86` (NuGet): affected `<14.10.3`; fixed in `14.10.3`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Magick.NET packages, including Magick.NET-Q16-x64 and related builds, are vulnerable in versions before 14.10.3 because of a memory leak in the ASHLAR image writer. An attacker who can supply a crafted image that is written with this encoder can exhaust process memory. Upgrade to version 14.10.3 or later.

Written 9 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0044, the 38th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:21 UTC: First seen by agentprime
- 31 Oct 2026, 15:21 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-gm37-qx7w-p258)

## Sources

- [GitHub Advisory Database: GHSA-gm37-qx7w-p258](https://github.com/advisories/GHSA-gm37-qx7w-p258)
- [OSV: GHSA-gm37-qx7w-p258](https://osv.dev/vulnerability/GHSA-gm37-qx7w-p258)
- <https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-gm37-qx7w-p258>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-25637>
- <https://github.com/ImageMagick/ImageMagick/commit/30ce0e8efbd72fd6b50ed3a10ae22f57c8901137>
- <https://github.com/ImageMagick/ImageMagick>
- <https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-gm37-qx7w-p258>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-gm37-qx7w-p258/>. Everything for agents: <https://agentprime.io/llms.txt>.