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

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Summary

CVECVE-2026-40183
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-13 22:16:29 UTC
Updated2026-04-13 22:16:29 UTC
DescriptionImageMagick 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

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

Problem Types: CWE-122 | CWE-122 CWE-122: Heap-based Buffer Overflow

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
3.1CNADECLARED5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ImageMagick ImageMagick affected < 7.1.2-19 Not specified

References

ReferenceSourceLinkTags
github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jvgr-9ph5-m8v4 [email protected] github.com
github.com/dlemstra/Magick.NET/releases/tag/14.12.0 [email protected] github.com
github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19 [email protected] github.com
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