CVE-2026-40312: ImageMagick: Off-by-One in MSL decoder could result in crash

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-13 · updated 2026-06-17
Weakness: CWE-193

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-19, an off by one error in the MSL decoder could result in a crash when a malicous MSL file is read. This issue has been fixed in version 7.1.2-19.

Affected products

ImageMagick: before 7.1.2-19 — fixed in 7.1.2-19

How to fix

Upgrade to a fixed version: ImageMagick 7.1.2-19. Check the vendor advisory for mitigations.

References

https://github.com/ImageMagick/ImageMagick/commit/2a06c7be3bba3326caf8b7a8d1fa2e0d4b88998d
https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-5xg3-585r-9jh5
https://github.com/dlemstra/Magick.NET/releases/tag/14.12.0

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