# ImageMagick has has a stack-buffer-overflow in MNG encoder with oversized pallete

Advisory record · `GHSA-98cp-rj9f-6v5g`

- **Identifiers:** `GHSA-98cp-rj9f-6v5g`
- **State:** Confirmed
- **Severity:** CVSS 6.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-121](https://cwe.mitre.org/data/definitions/121.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md)
- **Published:** 14 Apr 2026
- **Updated:** 16 Apr 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 14 Apr 2026, 23:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `Magick.NET-Q16-AnyCPU` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-HDRI-AnyCPU` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-HDRI-OpenMP-arm64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-HDRI-arm64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-HDRI-x64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-HDRI-x86` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-OpenMP-arm64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-OpenMP-x64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-arm64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-x64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-x86` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q16-HDRI-OpenMP-x64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q8-AnyCPU` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q8-OpenMP-arm64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q8-OpenMP-x64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q8-arm64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q8-x64` (NuGet): affected `<14.12.0`; fixed in `14.12.0`
- `Magick.NET-Q8-x86` (NuGet): affected `<14.12.0`; fixed in `14.12.0`

## Machine-written summary

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

> Magick.NET-Q16 packages before 14.12.0 have a stack buffer overflow in the MNG encoder when writing multi-frame images with an oversized palette, because an earlier fix for this was incomplete. The source gives few details on attacker requirements. Upgrade to 14.12.0 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

- 6.9 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** No score.

## Timeline

- 31 Oct 2026, 15:22 UTC: First seen by agentprime
- 31 Oct 2026, 15:22 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-98cp-rj9f-6v5g)

## Sources

- [GitHub Advisory Database: GHSA-98cp-rj9f-6v5g](https://github.com/advisories/GHSA-98cp-rj9f-6v5g)
- [OSV: GHSA-98cp-rj9f-6v5g](https://osv.dev/vulnerability/GHSA-98cp-rj9f-6v5g)
- <https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-98cp-rj9f-6v5g>
- <https://github.com/ImageMagick/ImageMagick>

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-98cp-rj9f-6v5g>, 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-98cp-rj9f-6v5g/>. Everything for agents: <https://agentprime.io/llms.txt>.