CVE-2026-40183

ImageMagick: Heap buffer overflow when encoding JXL image with a 16-bit float

State: Published
Severity: 5.5 Medium
Published: Apr 13, 2026
Updated: Apr 14, 2026
Reserved: Apr 9, 2026

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-19, the JXL encoder has an heap write overflow when a user specifies that the image should be encoded as 16 bit floats. This issue has been fixed in version 7.1.2-19.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
ImageMagickImageMagick	< 7.1.2-19Affected

References

https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jvgr-9ph5-m8v4
https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19
https://github.com/dlemstra/Magick.NET/releases/tag/14.12.0

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