CVE-2026-40183 PUBLISHED

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

Assigner: GitHub_M
Reserved: 09.04.2026 Published: 13.04.2026 Updated: 13.04.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Local	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	Required	Availability Impact	High

CVSS 3.1

Product Status

Vendor	ImageMagick
Product	ImageMagick
Versions	Version < 7.1.2-19 is affected

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

Problem Types

CWE-122: Heap-based Buffer Overflow CWE