CVE-2026-46559 ImageMagick: Heap Buffer Over-Write of a single byte in the JP2 encoder

What is CVE-2026-46559?

CVE-2026-46559 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, with no action from the victim.

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, an incorrect check in the JP2 will result in an heap buffer over-write of a single byte when specifying certain options. This issue has been patched in versions 6.9.13-48 and 7.1.2-23.

Weakness: CWE-787, CWE-193

Which versions are affected by CVE-2026-46559?

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-2026-46559?

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-2026-46559 being exploited?

There is no known exploitation of CVE-2026-46559 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 CLSA-2026-1782140015, CLSA-2026-1782140731, CLSA-2026-1782141218, DEBIAN-CVE-2026-46559, ECHO-5c07-3b17-da79, GHSA-533m-3wf6-c33v and 3 more.