CVE-2026-46521

ImageMagick: Heap Buffer Over-Write in MIFF encoder when using LZMA compression

State: Published
Severity: 5.5 Medium
Published: Jun 10, 2026
Updated: Jun 11, 2026
Reserved: May 14, 2026

Description

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 6.9.13-48 and 7.1.2-23, when using LZMA compression in the MIFF encoder an out of bounds write can occur due to a missing check. This issue has been patched in versions 6.9.13-48 and 7.1.2-23.

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-131 Incorrect Calculation of Buffer Size
CWE-252 Unchecked Return Value
CWE-787 Out-of-bounds Write
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

Product	Versions
ImageMagickImageMagick	< 6.9.13-48Affected < 7.1.2-23Affected

References

https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jcqp-6r6f-3mfx

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