CVE-2026-46521 ImageMagick: Heap Buffer Over-Write in MIFF encoder when using LZMA compression

What is CVE-2026-46521?

CVE-2026-46521 is a medium-severity memory corruption vulnerability in Imagemagick Imagemagick, published on 10 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-835, CWE-787, CWE-252, CWE-131

Which versions are affected by CVE-2026-46521?

36 open source packages ship an affected version, including Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU and Magick.NET-Q16-HDRI-OpenMP-arm64. It affects 1 product.

Products include Imagemagick Imagemagick.

How do I fix CVE-2026-46521?

Upgrade Magick.NET-Q16-AnyCPU to 14.13.1 or later.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-46521 being exploited?

There is no known exploitation of CVE-2026-46521 in the wild and no public exploit code.

Other vulnerabilities in Imagemagick Imagemagick

• CVE-2019-19952 Use after free in n/a Critical 9.8
• CVE-2018-16328 Null dereference in n/a Critical 9.8
• CVE-2018-16329 Null dereference in n/a Critical 9.8
• CVE-2017-18210 Null dereference in n/a Critical 9.8
• CVE-2017-14138 Denial of service in n/a Critical 9.8

All Imagemagick Imagemagick vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2026-46521, ECHO-3d1a-d16a-7322, GHSA-jcqp-6r6f-3mfx, JLSEC-2026-1013, MINI-6g22-g68p-2qv3, UBUNTU-CVE-2026-46521.