CVE-2026-40183

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

CVSS 5.5 MEDIUMEPSS 0.2%CWE-122

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.5EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

13 Apr 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

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

Affected products

ImageMagick · ImageMagick

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References

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